Introduction

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We would like to thank In Win and CaseKing.de for supplying the review sample.

It’s common knowledge that whatever is built for military purposes has great durability and long lifespan, since it is manufactured with the highest available standards in order to deal with the very tough conditions on the battlefield. As it seems In Win wanted users to think the same for their Commander PSU series so they made them look like military equipment. The initial Commander PSUs were built by Channel Well Technology (CWT) while the newer Commanders are based on platforms provided by Andyson. To tell you the truth we don't like this OEM change since CWT is a key player in this field while Andyson is known mostly for their low cost and average performing platforms. However we should not prejudge the outcome of this review, since we are still in the prologue and we have eight more pages to the conclusion.

Today’s sample is a Commander II 750W painted in a dark green color, the same hue that is heavily used by the armed forces all over the world. This unit features a semi-modular cabling design, has 80 PLUS Bronze certification, utilizes DC-DC converters for the minor rails generation and is equipped with a 135 mm double-ball bearing fan.

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Specifications

<table class="tputbl">
<thead>
<tr>
<th colspan="2">In Win IRP-COM750 II Features & Specs</th>
</tr>
</thead>
<tr>
<th scope="row">Max. DC Output</th>
<td align="center">750W</td>
</tr>
<tr class="alt">
<th scope="row">PFC</th>
<td align="center">Active PFC</td>
</tr>
<tr>
<th scope="row">Efficiency</th>
<td align="center">80 PLUS Bronze</td>
</tr>
<tr class="alt">
<th scope="row">Operating temperature</th>
<td align="center">0°C - 40°C</td>
</tr>
<tr>
<th scope="row">Protections</th>
<td align="center">Over Voltage Protection<br />
Under Voltage Protection<br />
Over Current Protection<br />
Over Power Protection<br />
Short Circuit Protection</td>
</tr>
<tr class="alt">
<th scope="row">Cooling</th>
<td align="center">135 mm Double Ball Bearing Fan</td>
</tr>
<tr>
<th scope="row">Dimensions</th>
<td align="center">150 mm (W) x 86 mm (H) x 165 mm (D)</td>
</tr>
<tr class="alt">
<th scope="row">Weight</th>
<td align="center">2 kg</td>
</tr>
<tr>
<th scope="row">Compliance</th>
<td align="center">ATX12V v2.3, EPS 2.91</td>
</tr>
<tr class="alt">
<th scope="row">Warranty</th>
<td align="center">5 years</td>
</tr>
<tr>
<th scope="row">Price at time of review (exc. VAT)</th>
<td align="center">$98.99</td>
</tr></table>

A military painted PSU that has only 40°C max operating temperature and on top of that it doesn't feature OTP (Over Temperature Protection). Well, this doesn't sound so good. Thankfully it's equipped with a ball bearing fan which has higher lifespan than sleeve bearing ones and the warranty is quite long for the price tag of the unit. Finally, besides the aforementioned OTP all other protections are available.

<table class="tputbl">
<thead>
<tr>
<th colspan="11"> In Win IRP-COM750 II Power Specs</th>
</tr>
</thead>
<tr>
<th scope="row">Rail</th>
<td align="center">3.3V</td>
<td align="center">5V</td>
<td align="center">12V1</td>
<td align="center">12V2</td>
<td align="center">12V3</td>
<td align="center">12V4</td>
<td align="center">5VSB</td>
<td align="center">-12V</td>
</tr>
<tr class="alt">
<th rowspan="3" scope="row">Max. Power</th>
<td align="center">24A</td>
<td align="center">30A</td>
<td align="center">32A</td>
<td align="center">32A</td>
<td align="center">32A</td>
<td align="center">32A</td>
<td align="center">3A</td>
<td align="center">0.5A</td>
</tr>
<tr>
<td colspan="2" align="center">150W</td>
<td colspan="4" align="center">648W</td>
<td align="center">15W</td>
<td align="center">6W</td>
</tr>
<tr>
<td colspan="6" align="center">729W</td>
<td colspan="2" align="center">21W</td>
</tr>
<tr class="alt">
<th scope="row">Total Max. Power</th>
<td colspan="8" align="center">750W</td>
</tr></table>

Four +12V rails co-exist in this PSU and their max combined power reaches 648W, still quite far from the 750W total power. Usually when DC-DC converters are utilized, like in this case, the max combined power of +12V is really close to the total since from this rail all other are generated so +12V alone should output the whole wattage of the unit.
The minor rails of the IRP-COM750 II are quite strong with 150W combined power and 5VSB can give up to 3A, a satisfactory output.

Cables & Connectors, Power Distribution

<table class="tputbl">
<thead>
<tr>
<th colspan="2" align="center">Native Cables</th>
</tr>
</thead>
<tr>
<th scope="row">ATX connector (560 mm)</th>
<td align="center">20+4 pin</td>
</tr>
<tr class="alt">
<th scope="row">8 pin EPS12V (630 mm)</th>
<td align="center">1</td>
</tr>
<tr>
<th scope="row">4+4 pin EPS12V/ATX12V (630 mm)</th>
<td align="center">1</td>
</tr>
<tr>
<th colspan="2" align="center">Modular Cables</th>
</tr>
<tr class="alt">
<th scope="row">6+2 pin PCIe (505 mm + 150 mm)</th>
<td align="center">4</td>
</tr>
<tr>
<th scope="row">4 pin Molex (505 mm+145 mm+145 mm+145 mm) / FDD (+145 mm)</th>
<td align="center">8 / 2</td>
</tr>
<tr class="alt">
<th scope="row">SATA (500 mm+150 mm+150 mm+150 mm)</th>
<td align="center">8</td>
</tr></table>

The main ATX and the modular PCIe cables are a little short for large cases (cave style). We would like them to have at least 600 mm length. The distance among connectors is the recommended by ATX spec. Regarding wire size, all connectors use 18 AWG gauges. Although this size is recommended by ATX spec we would highly prefer the use of thicker 16 AWG at least for the 24pin ATX connectors, since it would minimize cable resistance thus voltage drops at high loads.

<table class="tputbl">
<thead>
<tr>
<th colspan="2" align="center">Power Distribution</th>
</tr>
</thead>
<tr>
<th align="left" scope="row">12V1</th>
<td align="center">ATX, SATA, Peripheral</td>
</tr>
<tr class="alt">
<th align="left" scope="row">12V2</th>
<td align="center">8pin EPS, 4+4pin EPS</td>
</tr>
<tr>
<th align="left" scope="row">12V3</th>
<td align="center">PCIe1, PCIe2 (Bottom modular PCIe socket)</td>
<tr class="alt">
<th align="left" scope="row">12V4</th>
<td align="center">PCIe3, PCIe4 (Top modular PCIe socket)</td>
</tr></table>

The power distribution is adequate since the two EPS and the two pairs of PCIe connectors use dedicated 12V rails. Finally the 24pin ATX, SATA and peripheral connectors are powered from the remaining 12V rail.

Packaging

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The package's design strictly follows the army theme and as background it uses the woodland camo color scheme. On the face of the box there is a small angled photo of the unit and the capacity, 750W, is highlighted with large yellow fonts. Right below the capacity description we find a reference to the Japanese capacitors used and to the strict voltage regulation of 5%. Actually, according to ATX spec, a PSU is required to keep all of its rails within 5% range so when a manufacturer refers to strict/tight voltage regulation we expect to see under 3% deviation on all rails. On the rear of the box we find more comprehensive information about the unit's features, specifications, DC output and there is also a description of the available cables/connectors. Finally, in order to help you move around the box more easily there is a carrying handle on the top.

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Once we opened the box we found the user's manual and a nylon bag in which you can store the unused modular cables. The PSU is totally protected by packing foam and on top of that is wrapped in plastic, so its camouflage color won't suffer any damage during transportation. The bundle is quite rich and besides the above mentioned nylon bag and the user's manual it includes six Velcro ties, a set of fixing bolts, an AC power cord and the modular cables.

Exterior

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The dark green finish looks quite resistant to scratches and it's finger proof. On both sides there are ventilation holes and in the front we meet a honeycomb design exhaust grill and an On/Off switch. On the rear the modular panel has six sockets, two 8-pin for the PCIe cables and four 6-pin for the peripheral ones. The native cables are full sleeved back into the housing and the cable exit hole is covered by a grommet. The power specifications label is placed on the bottom of the unit and on it we find another military reference, the scheme of a wire fence right under model description.

A Look Inside

Before reading this page we strongly suggest to take a look at this article, which will help you understand the internal components of a PSU much better.

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As we already mentioned in the introduction, the OEM of the new Commanders is Andyson and the platform is rather modern since it utilizes synchronous design in the secondary and it has DC-DC converters for the minor rails generation. Not to long ago these characteristics could only be found in high-end units!

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The transient filter starts right at the AC receptacle with one X and two Y caps. It continues on the main PCB with two CM chokes, an MOV, one X and two Y caps. All essential components are here as you can see. The bridge rectifiers, two parallel GBU805, are bolted together on a heasink. Right in front of them we find the PFC input capacitor that filters the high frequency ripple of the rectified 100 Hz output (with 230V/50Hz power input) and the current sense resistors used by the APFC controller.

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The APFC mosfets are two SPW21N50C3 and the boost diode is an STTH15R06D. On the left of the boost diode there is the thermistor responsible for the inrush current protection during the start up phase of the PSU. The two parallel hold up capacitors are provided by Matsushita/Panasonic (400V, 330μF each and 660μF total, 105°C).

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The main switches are two SPW21N50C3 in the traditional double forward topology.

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The combo PFC/PWM controller is the famous CM6800. The latter is soldered on a vertical daughter-board in the primary side.

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Housekeeping duties are handled by a PS232S protections IC which supports OCP for up to four +12V rails, so it covers the unit's specifications.

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In the secondary there aren't any passive components (SBRs), something that greatly benefits efficiency. So the +12V are generated by three IRFB3306G mosfets. The minor rails are handled by two DC-DC converters which are wrapped in plastic, in order be isolated from the other components and minimize EMI. Besides the polymer caps used in the two VRMs all other are electrolytic and provided by Teapo (rated at 105°C), one of the most reliable Chinese caps manufacturer.

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In the front of the modular PCB there are five polymer caps for further ripple filtering. Very good choice that indeed helps in ripple suppression.

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Soldering quality is quite good with clean and well made solder joints. Also we did not spot any long component leads, something that greatly pleased us. Finally in the +12V area we spotted four shunt resistors, which measure the current drawn by each +12V rail providing vital information to the OCP.

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The cooling fan is provided by Young Lin Tech Co. and its model number is DFB132512H (12V, 3W, 1700RPM, 91.16CFM, 36.28dBA).

Test Setup

All measurements are performed utilizing ten electronic loads (seven Array 3711A, 300W each, and three Array 3710A, 150W each), which are able to deliver over 2500W of load and are controlled by a custom made software. We also use a Picoscope 3424 oscilloscope, a CHY 502 thermometer, a Fluke 175 multimeter and an Instek GPM-8212 power meter. Furthermore, in our setup we have included a wooden box, which along with a heating element is used as a Hot Box. Finally, we have at our disposal four more oscilloscopes (Rigol 1052E and VS5042, Stingray DS1M12 and a second Picoscope 3424) and a CEM DT-8852 sound level meter. In this article you will find more details about our equipment and the review methodology we follow. Finally, if the manufacturer states that the maximum operating temperature of the test unit is only 40°C then we try to stay near this temperature, otherwise we crank up the heat inside the hotbox up to 50°C.

Voltage Regulation Charts

The following charts show the voltage values of the main rails, recorded over a range from 60W to the maximum specified load, and the deviation (in percent) for the same load range.

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5VSB Regulation Chart

The following chart shows how the 5VSB rail deals with the load we throw at it.
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Efficiency Chart

In this chart you will find the efficiency of IRP-COM750 II at low loads and at loads equal to 20-100% of PSU’s maximum rated load.

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Voltage Regulation and Efficiency Measurements

The first set of tests reveals the stability of voltage rails and the efficiency of IRP-COM750 II. The applied load equals to (approximately) 20%, 40%, 50%, 60%, 80% and 100%, of the maximum load that the PSU can handle. In addition, we conduct two more tests. In the first we stress the two minor rails (5V & 3.3V) with a high load, while the load at +12V is only 2A and in the second test we dial the maximum load that +12V can handle while load at minor rails is minimal.

<table border="1" cellpadding="4" cellspacing="0" bordercolor="#aaaaaa" style="border-collapse:collapse">
<tr>
<th colspan="9" class="th1 tac" style="font-size:15pt"> Voltage Regulation & Efficiency Testing Data <br/>
In Win IRP-COM750 II</th>
</tr>
<tr bgcolor="#dddddd">
<td width="115" align="center" bgcolor="#DEE2E7"><strong>Test</strong></td>
<td width="80" align="center" bgcolor="#DEE2E7"><strong>12 V</strong></td>
<td width="80" align="center" bgcolor="#DEE2E7"><strong>5 V</strong></td>
<td width="80" align="center" bgcolor="#DEE2E7"><strong>3.3 V</strong></td>
<td width="80" align="center" bgcolor="#DEE2E7"><strong>5VSB</strong></td>
<td width="80" align="center" bgcolor="#DEE2E7"><strong>Power<br />
(DC/AC)</strong></td>
<td width="80" align="center" bgcolor="#DEE2E7"><strong>Efficiency</strong></td>
<td width="80" align="center" bgcolor="#DEE2E7"><strong>Temp<br />
(In/Out)</strong></td>
<td width="80" align="center" bgcolor="#DEE2E7"><strong>PF/AC <br>
Volts</strong></td>
</tr>
<tr>
<td rowspan="2" align="center" bgcolor="#DEE2E7"><strong>20% Load</strong></td>
<td align="center" bgcolor="#f9f9f9">10.547A</td>
<td align="center" bgcolor="#f9f9f9">1.999A</td>
<td align="center" bgcolor="#f9f9f9">1.941A</td>
<td align="center" bgcolor="#f9f9f9">0.983A</td>
<td align="center" bgcolor="#f9f9f9">150.00W</td>
<td rowspan="2" align="center" bgcolor="#f9f9f9">85.62%</td>
<td align="center" bgcolor="#f9f9f9">37.2°C</td>
<td align="center" bgcolor="#f9f9f9">0.942</td>
</tr>
<tr>
<td align="center" bgcolor="#f0f0f0">12.175V</td>
<td align="center" bgcolor="#f0f0f0">5.002V</td>
<td align="center" bgcolor="#f0f0f0">3.398V</td>
<td align="center" bgcolor="#f0f0f0">5.082V</td>
<td align="center" bgcolor="#f0f0f0">175.20W</td>
<td align="center" bgcolor="#f0f0f0">39.7°C</td>
<td align="center" bgcolor="#f0f0f0">230.9V</td>
</tr>
<tr>
<td rowspan="2" align="center" bgcolor="#DEE2E7"><strong>40% Load</strong></td>
<td align="center" bgcolor="#f9f9f9">21.497A</td>
<td align="center" bgcolor="#f9f9f9">4.020A</td>
<td align="center" bgcolor="#f9f9f9">3.932A</td>
<td align="center" bgcolor="#f9f9f9">1.188A</td>
<td align="center" bgcolor="#f9f9f9">300.00W</td>
<td rowspan="2" align="center" bgcolor="#f9f9f9">88.24%</td>
<td align="center" bgcolor="#f9f9f9">38.9°C</td>
<td align="center" bgcolor="#f9f9f9">0.973</td>
</tr>
<tr>
<td align="center" bgcolor="#f0f0f0">12.132V</td>
<td align="center" bgcolor="#f0f0f0">4.975V</td>
<td align="center" bgcolor="#f0f0f0">3.357V</td>
<td align="center" bgcolor="#f0f0f0">5.047V</td>
<td align="center" bgcolor="#f0f0f0">340.00W</td>
<td align="center" bgcolor="#f0f0f0">42.3°C</td>
<td align="center" bgcolor="#f0f0f0">230.1V</td>
</tr>
<tr>
<td rowspan="2" align="center" bgcolor="#DEE2E7"><strong>50% Load</strong></td>
<td align="center" bgcolor="#f9f9f9">26.881A</td>
<td align="center" bgcolor="#f9f9f9">5.052A</td>
<td align="center" bgcolor="#f9f9f9">4.950A</td>
<td align="center" bgcolor="#f9f9f9">1.602A</td>
<td align="center" bgcolor="#f9f9f9">375.00W</td>
<td rowspan="2" align="center" bgcolor="#f9f9f9">88.19%</td>
<td align="center" bgcolor="#f9f9f9">40.9°C</td>
<td align="center" bgcolor="#f9f9f9">0.979</td>
</tr>
<tr>
<td align="center" bgcolor="#f0f0f0">12.109V</td>
<td align="center" bgcolor="#f0f0f0">4.948V</td>
<td align="center" bgcolor="#f0f0f0">3.333V</td>
<td align="center" bgcolor="#f0f0f0">4.993V</td>
<td align="center" bgcolor="#f0f0f0">425.20W</td>
<td align="center" bgcolor="#f0f0f0">44.9°C</td>
<td align="center" bgcolor="#f0f0f0">230.0V</td>
</tr>
<tr>
<td rowspan="2" align="center" bgcolor="#DEE2E7"><strong>60% Load</strong></td>
<td align="center" bgcolor="#f9f9f9">32.296A</td>
<td align="center" bgcolor="#f9f9f9">6.095A</td>
<td align="center" bgcolor="#f9f9f9">5.983A</td>
<td align="center" bgcolor="#f9f9f9">2.021A</td>
<td align="center" bgcolor="#f9f9f9">450.00W</td>
<td rowspan="2" align="center" bgcolor="#f9f9f9">87.99%</td>
<td align="center" bgcolor="#f9f9f9">41.6°C</td>
<td align="center" bgcolor="#f9f9f9">0.980</td>
</tr>
<tr>
<td align="center" bgcolor="#f0f0f0">12.082V</td>
<td align="center" bgcolor="#f0f0f0">4.922V</td>
<td align="center" bgcolor="#f0f0f0">3.309V</td>
<td align="center" bgcolor="#f0f0f0">4.948V</td>
<td align="center" bgcolor="#f0f0f0">511.45W</td>
<td align="center" bgcolor="#f0f0f0">46.4°C</td>
<td align="center" bgcolor="#f0f0f0">229.5V</td>
</tr>
<tr>
<td rowspan="2" align="center" bgcolor="#DEE2E7"><strong>80% Load</strong></td>
<td align="center" bgcolor="#f9f9f9">43.323A</td>
<td align="center" bgcolor="#f9f9f9">8.186A</td>
<td align="center" bgcolor="#f9f9f9">8.093A</td>
<td align="center" bgcolor="#f9f9f9">2.460A</td>
<td align="center" bgcolor="#f9f9f9">600.00W</td>
<td rowspan="2" align="center" bgcolor="#f9f9f9">87.21%</td>
<td align="center" bgcolor="#f9f9f9">43.4°C</td>
<td align="center" bgcolor="#f9f9f9">0.984</td>
</tr>
<tr>
<td align="center" bgcolor="#f0f0f0">12.040V</td>
<td align="center" bgcolor="#f0f0f0">4.886V</td>
<td align="center" bgcolor="#f0f0f0">3.262V</td>
<td align="center" bgcolor="#f0f0f0">4.877V</td>
<td align="center" bgcolor="#f0f0f0">688.00W</td>
<td align="center" bgcolor="#f0f0f0">49.3°C</td>
<td align="center" bgcolor="#f0f0f0">228.7V</td>
</tr>
<tr>
<td rowspan="2" align="center" bgcolor="#DEE2E7"><strong>100% Load</strong></td>
<td align="center" bgcolor="#f9f9f9">55.072A</td>
<td align="center" bgcolor="#f9f9f9">9.278A</td>
<td align="center" bgcolor="#f9f9f9">9.201A</td>
<td align="center" bgcolor="#f9f9f9">3.136A</td>
<td align="center" bgcolor="#f9f9f9">749.85W</td>
<td rowspan="2" align="center" bgcolor="#f9f9f9">85.89%</td>
<td align="center" bgcolor="#f9f9f9">45.0°C</td>
<td align="center" bgcolor="#f9f9f9">0.989</td>
</tr>
<tr>
<td align="center" bgcolor="#f0f0f0">11.987V</td>
<td align="center" bgcolor="#f0f0f0">4.850V</td>
<td align="center" bgcolor="#f0f0f0">3.228V</td>
<td align="center" bgcolor="#f0f0f0">4.783V</td>
<td align="center" bgcolor="#f0f0f0">873.00W</td>
<td align="center" bgcolor="#f0f0f0">52.3°C</td>
<td align="center" bgcolor="#f0f0f0">227.8V</td>
</tr>
<tr>
<td rowspan="2" align="center" bgcolor="#DEE2E7"><strong>Crossload 1</strong></td>
<td align="center" bgcolor="#f9f9f9">1.994A</td>
<td align="center" bgcolor="#f9f9f9">18.000A</td>
<td align="center" bgcolor="#f9f9f9">18.000A</td>
<td align="center" bgcolor="#f9f9f9">0.500A</td>
<td align="center" bgcolor="#f9f9f9">169.35W</td>
<td rowspan="2" align="center" bgcolor="#f9f9f9">77.40%</td>
<td align="center" bgcolor="#f9f9f9">43.3°C</td>
<td align="center" bgcolor="#f9f9f9">0.954</td>
</tr>
<tr>
<td align="center" bgcolor="#f0f0f0">12.157V</td>
<td align="center" bgcolor="#f0f0f0">4.770V</td>
<td align="center" bgcolor="#f0f0f0">3.150V</td>
<td align="center" bgcolor="#f0f0f0">5.087V</td>
<td align="center" bgcolor="#f0f0f0">218.80W</td>
<td align="center" bgcolor="#f0f0f0">48.4°C</td>
<td align="center" bgcolor="#f0f0f0">231.4V</td>
</tr>
<tr>
<td rowspan="2" align="center" bgcolor="#DEE2E7"><strong>Crossload 2</strong></td>
<td align="center" bgcolor="#f9f9f9">54.007A</td>
<td align="center" bgcolor="#f9f9f9">1.000A</td>
<td align="center" bgcolor="#f9f9f9">1.000A</td>
<td align="center" bgcolor="#f9f9f9">1.000A</td>
<td align="center" bgcolor="#f9f9f9">662.20W</td>
<td rowspan="2" align="center" bgcolor="#f9f9f9">87.48%</td>
<td align="center" bgcolor="#f9f9f9">44.1°C</td>
<td align="center" bgcolor="#f9f9f9">0.986</td>
</tr>
<tr>
<td align="center" bgcolor="#f0f0f0">12.014V</td>
<td align="center" bgcolor="#f0f0f0">4.980V</td>
<td align="center" bgcolor="#f0f0f0">3.368V</td>
<td align="center" bgcolor="#f0f0f0">5.016V</td>
<td align="center" bgcolor="#f0f0f0">757.00W</td>
<td align="center" bgcolor="#f0f0f0">50.8°C</td>
<td align="center" bgcolor="#f0f0f0">226.6V</td>
</tr></table>

Efficiency is quite high for a Bronze unit but voltage regulation is nothing to write home about. Only +12V are below 2% while 5V are near to 3.4% and 3.3V go off limits since they exceed 5% deviation. Finally 5VSB registered high voltage drops with 2.5 and 3.1A loads leading to the worst deviation we have ever seen at this rail, a huge 7.36%. But enough with the bad news, let's mention two good ones. First PF readings are quite high even with 20% load and second although the stated max operating temperature is 40°C the PSU worked flawlessly with full load at 45°C. To sum up, if 3.3V and 5VSB managed to stay within limits and preferably under 4% deviation then things would be very good since we were left satisfied by efficiency throughout 20-100% load and voltage regulation at +12V.

Efficiency at Low Loads

In the next tests, we measure the efficiency of IRP-COM750 II at loads much lower than 20% of its maximum rated load (the lowest load that the 80 Plus Standard measures). The loads that we dial are 40, 60, 80 and 100W (for PSUs with over 500W capacity). This is important for scenarios in which a typical office PC is in idle with power saving turned on.

<table border="1" cellpadding="4" cellspacing="0" bordercolor="#aaaaaa" style="border-collapse:collapse">
<tr>
<th colspan="8" class="th1 tac" style="font-size:15pt"> Efficiency at Low Loads <br/>
In Win IRP-COM750 II</th>
</tr>
<tr>
<td width="100" align="center" bgcolor="#DEE2E7"><strong>Test #</strong></td>
<td width="80" align="center" bgcolor="#DEE2E7"><strong>12 V</strong></td>
<td width="80" align="center" bgcolor="#DEE2E7"><strong>5 V</strong></td>
<td width="80" align="center" bgcolor="#DEE2E7"><strong>3.3 V</strong></td>
<td width="80" align="center" bgcolor="#DEE2E7"><strong>5 VSB</strong></td>
<td width="80" align="center" bgcolor="#DEE2E7"><strong>Power<br />
(DC/AC)</strong></td>
<td width="80" align="center" bgcolor="#DEE2E7"><strong>Efficiency</strong></td>
<td width="80" align="center" bgcolor="#DEE2E7"><strong>PF/AC <br>
Volts</strong></td>
</tr>
<tr>
<td rowspan="2" align="center" bgcolor="#DEE2E7"><strong>1</strong></td>
<td align="center" bgcolor="#f9f9f9">1.836A</td>
<td align="center" bgcolor="#f9f9f9">1.992A</td>
<td align="center" bgcolor="#f9f9f9">1.934A</td>
<td align="center" bgcolor="#f9f9f9">0.193A</td>
<td align="center" bgcolor="#f9f9f9">40.00W</td>
<td rowspan="2" align="center" bgcolor="#f9f9f9">65.90%</td>
<td align="center" bgcolor="#f9f9f9">0.787</td>
</tr>
<tr>
<td align="center" bgcolor="#f0f0f0">12.204V</td>
<td align="center" bgcolor="#f0f0f0">5.020V</td>
<td align="center" bgcolor="#f0f0f0">3.413V</td>
<td align="center" bgcolor="#f0f0f0">5.163V</td>
<td align="center" bgcolor="#f0f0f0">60.70W</td>
<td align="center" bgcolor="#f0f0f0">231.7V</td>
</tr>
<tr>
<td rowspan="2" align="center" bgcolor="#DEE2E7"><strong>2</strong></td>
<td align="center" bgcolor="#f9f9f9">3.393A</td>
<td align="center" bgcolor="#f9f9f9">1.992A</td>
<td align="center" bgcolor="#f9f9f9">1.934A</td>
<td align="center" bgcolor="#f9f9f9">0.389A</td>
<td align="center" bgcolor="#f9f9f9">60.00W</td>
<td rowspan="2" align="center" bgcolor="#f9f9f9">73.35%</td>
<td align="center" bgcolor="#f9f9f9">0.851</td>
</tr>
<tr>
<td align="center" bgcolor="#f0f0f0">12.204V</td>
<td align="center" bgcolor="#f0f0f0">5.020V</td>
<td align="center" bgcolor="#f0f0f0">3.411V</td>
<td align="center" bgcolor="#f0f0f0">5.136V</td>
<td align="center" bgcolor="#f0f0f0">81.80W</td>
<td align="center" bgcolor="#f0f0f0">232.1V</td>
</tr>
<tr>
<td rowspan="2" align="center" bgcolor="#DEE2E7"><strong>3</strong></td>
<td align="center" bgcolor="#f9f9f9">4.957A</td>
<td align="center" bgcolor="#f9f9f9">1.992A</td>
<td align="center" bgcolor="#f9f9f9">1.935A</td>
<td align="center" bgcolor="#f9f9f9">0.584A</td>
<td align="center" bgcolor="#f9f9f9">80.00W</td>
<td rowspan="2" align="center" bgcolor="#f9f9f9">77.56%</td>
<td align="center" bgcolor="#f9f9f9">0.888</td>
</tr>
<tr>
<td align="center" bgcolor="#f0f0f0">12.186V</td>
<td align="center" bgcolor="#f0f0f0">5.020V</td>
<td align="center" bgcolor="#f0f0f0">3.409V</td>
<td align="center" bgcolor="#f0f0f0">5.136V</td>
<td align="center" bgcolor="#f0f0f0">103.15W</td>
<td align="center" bgcolor="#f0f0f0">232.0V</td>
</tr>
<tr>
<td rowspan="2" align="center" bgcolor="#DEE2E7"><strong>4</strong></td>
<td align="center" bgcolor="#f9f9f9">6.521A</td>
<td align="center" bgcolor="#f9f9f9">1.992A</td>
<td align="center" bgcolor="#f9f9f9">1.937A</td>
<td align="center" bgcolor="#f9f9f9">0.782A</td>
<td align="center" bgcolor="#f9f9f9">100.00W</td>
<td rowspan="2" align="center" bgcolor="#f9f9f9">80.19%</td>
<td align="center" bgcolor="#f9f9f9">0.909</td>
</tr>
<tr>
<td align="center" bgcolor="#f0f0f0">12.177V</td>
<td align="center" bgcolor="#f0f0f0">5.020V</td>
<td align="center" bgcolor="#f0f0f0">3.407V</td>
<td align="center" bgcolor="#f0f0f0">5.109V</td>
<td align="center" bgcolor="#f0f0f0">124.70W</td>
<td align="center" bgcolor="#f0f0f0">231.6V</td>
</tr></table>

Efficiency at low loads isn't so good. With 40W load it is nearly 66% and with 60W and 80W still under 80%. Only with 100W load the PSU manages to surpass the 80% mark. As it seems Andyson tuned the unit to perform more efficient with loads over 20% of max rated capacity and crippled efficiency at lower loads, in order to easily pass the 80 PLUS requirements. However they overlooked the fact that a PSU will spend a significant period of its lifespan working with loads below 20%.

5VSB Efficiency

ATX spec states that the 5VSB standby supply's efficiency should be as high as possible and recommends 50% or higher efficiency with 100mA load, 60% or higher with 250mA load and 70% or higher with 1A or more load.
We will take four measurements, three at 100 / 250 / 1000 mA and one with the full load that 5VSB rail can handle.

<table border="1" cellpadding="4" cellspacing="0" bordercolor="#aaaaaa" style="border-collapse:collapse">
<tr>
<th colspan="5" class="th1 tac" style="font-size:15pt"> 5VSB Efficiency<br/>
In Win IRP-COM750 II</th>
</tr>
<tr>
<td width="100" align="center" bgcolor="#DEE2E7"><strong>Test #</strong></td>
<td width="100" align="center" bgcolor="#DEE2E7"><strong>5VSB</strong></td>
<td width="100" align="center" bgcolor="#DEE2E7"><strong>Power (DC/AC)</strong></td>
<td width="100" align="center" bgcolor="#DEE2E7"><strong>Efficiency</strong></td>
<td width="100" align="center" bgcolor="#DEE2E7"><strong>PF/AC Volts</strong></td>
</tr>
<tr>
<td rowspan="2" align="center" bgcolor="#DEE2E7"><strong>1</strong></td>
<td align="center" bgcolor="#f9f9f9">0.100A</td>
<td align="center" bgcolor="#f9f9f9">0.52W</td>
<td rowspan="2" align="center" bgcolor="#f9f9f9">63.42%</td>
<td align="center" bgcolor="#f9f9f9">0.029</td>
</tr>
<tr>
<td align="center" bgcolor="#f0f0f0">5.190V</td>
<td align="center" bgcolor="#f0f0f0">0.82W</td>
<td align="center" bgcolor="#f0f0f0">232.6V</td>
</tr>
<tr>
<td rowspan="2" align="center" bgcolor="#DEE2E7"><strong>2</strong></td>
<td align="center" bgcolor="#f9f9f9">0.250A</td>
<td align="center" bgcolor="#f9f9f9">1.29W</td>
<td rowspan="2" align="center" bgcolor="#f9f9f9">67.19%</td>
<td align="center" bgcolor="#f9f9f9">0.067</td>
</tr>
<tr>
<td align="center" bgcolor="#f0f0f0">5.163V</td>
<td align="center" bgcolor="#f0f0f0">1.92W</td>
<td align="center" bgcolor="#f0f0f0">232.5V</td>
</tr>
<tr>
<td rowspan="2" align="center" bgcolor="#DEE2E7"><strong>3</strong></td>
<td align="center" bgcolor="#f9f9f9">1.000A</td>
<td align="center" bgcolor="#f9f9f9">5.11W</td>
<td rowspan="2" align="center" bgcolor="#f9f9f9">74.60%</td>
<td align="center" bgcolor="#f9f9f9">0.212</td>
</tr>
<tr>
<td align="center" bgcolor="#f0f0f0">5.109V</td>
<td align="center" bgcolor="#f0f0f0">6.85W</td>
<td align="center" bgcolor="#f0f0f0">232.6V</td>
</tr>
<tr>
<td rowspan="2" align="center" bgcolor="#DEE2E7"><strong>4</strong></td>
<td align="center" bgcolor="#f9f9f9">3.000A</td>
<td align="center" bgcolor="#f9f9f9">14.79W</td>
<td rowspan="2" align="center" bgcolor="#f9f9f9">74.14%</td>
<td align="center" bgcolor="#f9f9f9">0.403</td>
</tr>
<tr>
<td align="center" bgcolor="#f0f0f0">4.930V</td>
<td align="center" bgcolor="#f0f0f0">19.95W</td>
<td align="center" bgcolor="#f0f0f0">232.7V</td>
</tr></table>

With only 0.1A load at 5VSB efficiency is really high, with 0.25A it is fairly good and in the last two tests it is just passable. The efficiency drop from 1A to 3A shows that 5VSB are pretty stressed at full load and the manufacturer should drop the max power by 2.5W or 0.5A, claiming 2.5A instead of 3A.

Power Consumption in Idle & Standby

In the table below you will find the power consumption and the voltage values of all rails (except -12V), when the PSU is in idle mode (On but without any load at its rails) and the power consumption when the PSU is in standby (without any load at 5VSB).

<table border="1" cellpadding="4" cellspacing="0" bordercolor="#aaaaaa" style="border-collapse:collapse">
<tr>
<th colspan="7" class="th1 tac" style="font-size:15pt"> Idle / Standby <br/>
In Win IRP-COM750 II</th>
</tr>
<tr>
<td width="100" align="center" bgcolor="#DEE2E7"><strong>Mode</strong></td>
<td width="80" align="center" bgcolor="#DEE2E7"><strong>12 V</strong></td>
<td width="80" align="center" bgcolor="#DEE2E7"><strong>5 V</strong></td>
<td width="80" align="center" bgcolor="#DEE2E7"><strong>3.3 V</strong></td>
<td width="80" align="center" bgcolor="#DEE2E7"><strong>5VSB</strong></td>
<td width="85" align="center" bgcolor="#DEE2E7"><strong>Power (AC)</strong></td>
<td width="80" align="center" bgcolor="#DEE2E7"><strong>PF/AC Volts</strong></td>
</tr>
<tr>
<td rowspan="2" align="center" bgcolor="#DEE2E7"><strong>Idle</strong></td>
<td rowspan="2" align="center" bgcolor="#f0f0f0">12.208V</td>
<td rowspan="2" align="center" bgcolor="#f0f0f0">5.056V</td>
<td rowspan="2" align="center" bgcolor="#f0f0f0">3.446V</td>
<td rowspan="2" align="center" bgcolor="#f0f0f0">5.190V</td>
<td rowspan="2" align="center" bgcolor="#f0f0f0">15.10W</td>
<td align="center" bgcolor="#f0f0f0">0.388</td>
</tr>
<tr>
<td align="center" bgcolor="#f9f9f9">232.8V</td>
</tr>
<tr>
<td rowspan="2" colspan="5" align="center" bgcolor="#DEE2E7"><strong>Standby</strong></td>
<td rowspan="2" align="center" bgcolor="#f0f0f0">0.14W</td>
<td align="center" bgcolor="#f0f0f0">0.007</td>
</tr>
<tr>
<td align="center" bgcolor="#f9f9f9">232.8V</td>
</tr></table>

Phantom power is really low at 0.14W so the PSU easily meets the ErP Lot 6 requirements, both 2010 and the future 2013 ones.

Cross Load Tests

For the generation of the following charts we set our loaders in auto mode, through our custom software, and try over a thousand possible load combinations with +12V, 5V and 3.3V rails. The voltage regulation deviations in each of the below charts are calculated taking the nominal values of the rails (12V, 5V and 3.3V) as point zero. We should note here that we will run this test only with PSUs that have capacity equal or lower than 800W since it takes way too long and as the capacity increases the completion time increases exponentially.

+12V Voltage Regulation Chart

http://www.techpowerup.com/reviews/I...ges/CL_12V.jpg

5V Voltage Regulation Chart

http://www.techpowerup.com/reviews/I...ages/CL_5V.jpg

3.3V Voltage Regulation Chart

http://www.techpowerup.com/reviews/I...ges/CL_33V.jpg

Efficiency Chart

http://www.techpowerup.com/reviews/I...efficiency.jpg

+12V Ripple Chart

http://www.techpowerup.com/reviews/I...ipple_12V1.jpg

5V Ripple Chart

http://www.techpowerup.com/reviews/I..._ripple_5V.jpg

3.3V Ripple Chart

http://www.techpowerup.com/reviews/I...ripple_33V.jpg

5VSB Ripple Chart

http://www.techpowerup.com/reviews/I...ipple_5VSB.jpg

Advanced Transient Response Tests

In these tests we monitor the response of the PSU in two different scenarios. First a transient load (11A at +12V, 5A at 5V, 6A at 3.3V and 0.5A at 5VSB) is applied for 50 ms to the PSU, while the latter is working at a 20% load state. In the second scenario the PSU, while working with 50% load, is hit by the same transient load. In both tests, we measure the voltage drops that the transient load causes, using our oscilloscope. In any case voltages should remain within the regulation limits specified by the ATX specification. We must stress here, that the above tests are crucial, since they simulate transient loads that a PSU is very likely to handle (e.g. starting of a RAID array, an instant 100% load of CPU/VGAs etc.) We call these tests “Advanced Transient Response Tests” and they are designed to be very tough to master, especially for PSUs with capacities lower than 500W.

<div style="float:left">http://www.techpowerup.com/reviews/I...ansient_20.gif</div><div style="float:left"><table border="1" cellpadding="4" cellspacing="0" bordercolor="#aaaaaa" style="border-collapse:collapse">
<tr>
<th colspan="5" class="th1 tac" style="font-size:15pt"> Advanced Transient Response 20%</th>
</tr>
<tr>
<td align="center" bgcolor="#DEE2E7"><strong>Voltage</strong></td>
<td align="center" bgcolor="#DEE2E7"><strong>Before</strong></td>
<td align="center" bgcolor="#DEE2E7"><strong>After</strong></td>
<td align="center" bgcolor="#DEE2E7"><strong>Change</strong></td>
<td align="center" bgcolor="#DEE2E7"><strong>Pass/Fail</strong></td>
</tr>
<tr>
<td align="center" bgcolor="#DEE2E7"><strong>12 V</strong></td>
<td align="center" bgcolor="#f9f9f9">12.171V</td>
<td align="center" bgcolor="#f9f9f9">12.047V</td>
<td align="center" bgcolor="#f9f9f9">1.02%</td>
<td align="center" bgcolor="#f9f9f9">Pass</td>
</tr>
<tr>
<td align="center" bgcolor="#DEE2E7"><strong>5 V</strong></td>
<td align="center" bgcolor="#f9f9f9">5.011V</td>
<td align="center" bgcolor="#f9f9f9">4.912V</td>
<td align="center" bgcolor="#f9f9f9">1.98%</td>
<td align="center" bgcolor="#f9f9f9">Pass</td>
</tr>
<tr>
<td align="center" bgcolor="#DEE2E7"><strong>3.3 V</strong></td>
<td align="center" bgcolor="#f9f9f9">3.402V</td>
<td align="center" bgcolor="#f9f9f9">3.295V</td>
<td align="center" bgcolor="#f9f9f9">3.15%</td>
<td align="center" bgcolor="#f9f9f9">Pass</td>
</tr>
<tr>
<td align="center" bgcolor="#DEE2E7"><strong>5VSB</strong></td>
<td align="center" bgcolor="#f9f9f9">5.073V</td>
<td align="center" bgcolor="#f9f9f9">4.957V</td>
<td align="center" bgcolor="#f9f9f9">2.29%</td>
<td align="center" bgcolor="#f9f9f9">Pass</td>
</tr></table></div><div style="clear:both"></div>

<div style="float:left">http://www.techpowerup.com/reviews/I...ansient_50.gif</div><div style="float:left"></div><table border="1" cellpadding="4" cellspacing="0" bordercolor="#aaaaaa" style="border-collapse:collapse">
<tr>
<th colspan="5" class="th1 tac" style="font-size:15pt"> Advanced Transient Response 50%</th>
</tr>
<tr>
<td align="center" bgcolor="#DEE2E7"><strong>Voltage</strong></td>
<td align="center" bgcolor="#DEE2E7"><strong>Before</strong></td>
<td align="center" bgcolor="#DEE2E7"><strong>After</strong></td>
<td align="center" bgcolor="#DEE2E7"><strong>Change</strong></td>
<td align="center" bgcolor="#DEE2E7"><strong>Pass/Fail</strong></td>
</tr>
<tr>
<td align="center" bgcolor="#DEE2E7"><strong>12 V</strong></td>
<td align="center" bgcolor="#f9f9f9">12.109V</td>
<td align="center" bgcolor="#f9f9f9">11.997V</td>
<td align="center" bgcolor="#f9f9f9">0.92%</td>
<td align="center" bgcolor="#f9f9f9">Pass</td>
</tr>
<tr>
<td align="center" bgcolor="#DEE2E7"><strong>5 V</strong></td>
<td align="center" bgcolor="#f9f9f9">4.948V</td>
<td align="center" bgcolor="#f9f9f9">4.849V</td>
<td align="center" bgcolor="#f9f9f9">2.00%</td>
<td align="center" bgcolor="#f9f9f9">Pass</td>
</tr>
<tr>
<td align="center" bgcolor="#DEE2E7"><strong>3.3 V</strong></td>
<td align="center" bgcolor="#f9f9f9">3.332V</td>
<td align="center" bgcolor="#f9f9f9">3.226V</td>
<td align="center" bgcolor="#f9f9f9">3.18%</td>
<td align="center" bgcolor="#f9f9f9">Pass</td>
</tr>
<tr>
<td align="center" bgcolor="#DEE2E7"><strong>5VSB</strong></td>
<td align="center" bgcolor="#f9f9f9">4.984V</td>
<td align="center" bgcolor="#f9f9f9">4.862V</td>
<td align="center" bgcolor="#f9f9f9">4.23%</td>
<td align="center" bgcolor="#f9f9f9">Pass</td>
</tr></table><div style="clear:both"></div>

Judging from the lousy voltage regulation at 3.3V and 5VSB we expected a massacre here but on the contrary, the PSU positively surprised us. All voltage drops stayed well within 5% range and only 5VSB in the second test registered close to 4.25% deviation. Overall the unit performed quite well here.

Below you will find the oscilloscope screenshots that we took during Advanced Transient Response Testing.

Transient Response at 20% Load

http://www.techpowerup.com/reviews/I...n_20_small.jpg http://www.techpowerup.com/reviews/I...n_20_small.jpg http://www.techpowerup.com/reviews/I...n_20_small.jpg http://www.techpowerup.com/reviews/I...n_20_small.jpg

Transient Response at 50% Load

http://www.techpowerup.com/reviews/I...n_50_small.jpg http://www.techpowerup.com/reviews/I...n_50_small.jpg http://www.techpowerup.com/reviews/I...n_50_small.jpg http://www.techpowerup.com/reviews/I...n_50_small.jpg

Turn-On Transient Tests

In the next set of tests we measure the response of the PSU in simpler scenarios of transient loads, during the turn on phase of the PSU. In the first test we turn off the PSU, dial 2A load at 5VSB and then switch on the PSU. In the second test, while the PSU is in standby, we dial the maximum load that +12V can handle and we start the PSU. In the last test, while the PSU is completely switched off (we cut off power or switch off the PSU's On/Off switch), we dial the maximum load that +12V can handle and then we switch on the PSU from the loader and we restore power. The ATX specification states that recorded spikes on all rails should not exceed 10% of their nominal values (e.g. +10% for 12V is 13.2V and for 5V is 5.5V).

http://www.techpowerup.com/reviews/I...5vsb_small.jpg http://www.techpowerup.com/reviews/I..._stb_small.jpg http://www.techpowerup.com/reviews/I..._off_small.jpg
The 5VSB rail performed very well here while the only thing that stands in the way for a perfect +12V waveform, in both tests, is a small step at around 11V. Finally the rise time on all thee tests is within ATX spec range (0.2-20ms). Overall fairly good performance here.

Ripple Measurements

In the following table you will find the ripple levels that we measured on the main rails of IRP-COM750 II. According to ATX specification the limits are 120 mV (+12V) and 50 mV (5V, 3.3V and 5VSB).

<table border="1" cellpadding="4" cellspacing="0" bordercolor="#aaaaaa" style="border-collapse:collapse">
<tr>
<th colspan="6" class="th1 tac" style="font-size:15pt"> Ripple Measurements<br/>
In Win IRP-COM750 II</th>
</tr>
<tr>
<td width="100" align="center" bgcolor="#DEE2E7"><strong>Test</strong></td>
<td width="80" align="center" bgcolor="#DEE2E7"><strong>12 V</strong></td>
<td width="80" align="center" bgcolor="#DEE2E7"><strong>5 V</strong></td>
<td width="80" align="center" bgcolor="#DEE2E7"><strong>3.3 V</strong></td>
<td width="80" align="center" bgcolor="#DEE2E7"><strong>5VSB</strong></td>
<td width="80" align="center" bgcolor="#DEE2E7"><strong>Pass/Fail</strong></td>
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<td align="center" bgcolor="#DEE2E7"><strong>20% Load</strong></td>
<td align="center" bgcolor="#f9f9f9">7.1 mV</td>
<td align="center" bgcolor="#f9f9f9">4.2 mV</td>
<td align="center" bgcolor="#f9f9f9">3.6 mV</td>
<td align="center" bgcolor="#f9f9f9">5.3 mV</td>
<td align="center" bgcolor="#f9f9f9">Pass</td>
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<td align="center" bgcolor="#DEE2E7"><strong>40% Load</strong></td>
<td align="center" bgcolor="#f9f9f9">9.3 mV</td>
<td align="center" bgcolor="#f9f9f9">5.2 mV</td>
<td align="center" bgcolor="#f9f9f9">3.7 mV</td>
<td align="center" bgcolor="#f9f9f9">6.3 mV</td>
<td align="center" bgcolor="#f9f9f9">Pass</td>
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<td align="center" bgcolor="#DEE2E7"><strong>50% Load</strong></td>
<td align="center" bgcolor="#f9f9f9">11.0 mV</td>
<td align="center" bgcolor="#f9f9f9">5.3 mV</td>
<td align="center" bgcolor="#f9f9f9">4.0 mV</td>
<td align="center" bgcolor="#f9f9f9">6.7 mV</td>
<td align="center" bgcolor="#f9f9f9">Pass</td>
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<td align="center" bgcolor="#DEE2E7"><strong>60% Load</strong></td>
<td align="center" bgcolor="#f9f9f9">12.9 mV</td>
<td align="center" bgcolor="#f9f9f9">6.3 mV</td>
<td align="center" bgcolor="#f9f9f9">4.1 mV</td>
<td align="center" bgcolor="#f9f9f9">8.1 mV</td>
<td align="center" bgcolor="#f9f9f9">Pass</td>
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<td align="center" bgcolor="#DEE2E7"><strong>80% Load</strong></td>
<td align="center" bgcolor="#f9f9f9">16.7 mV</td>
<td align="center" bgcolor="#f9f9f9">8.0 mV</td>
<td align="center" bgcolor="#f9f9f9">4.6 mV</td>
<td align="center" bgcolor="#f9f9f9">10.4 mV</td>
<td align="center" bgcolor="#f9f9f9">Pass</td>
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<tr>
<td align="center" bgcolor="#DEE2E7"><strong>100% Load</strong></td>
<td align="center" bgcolor="#f9f9f9">20.3 mV</td>
<td align="center" bgcolor="#f9f9f9">8.1 mV</td>
<td align="center" bgcolor="#f9f9f9">4.9 mV</td>
<td align="center" bgcolor="#f9f9f9">10.7 mV</td>
<td align="center" bgcolor="#f9f9f9">Pass</td>
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<td align="center" bgcolor="#DEE2E7"><strong>Crossload 1</strong></td>
<td align="center" bgcolor="#f9f9f9">10.4 mV</td>
<td align="center" bgcolor="#f9f9f9">4.3 mV</td>
<td align="center" bgcolor="#f9f9f9">4.0 mV</td>
<td align="center" bgcolor="#f9f9f9">11.6 mV</td>
<td align="center" bgcolor="#f9f9f9">Pass</td>
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<td align="center" bgcolor="#DEE2E7"><strong>Crossload 2</strong></td>
<td align="center" bgcolor="#f9f9f9">18.5 mV</td>
<td align="center" bgcolor="#f9f9f9">8.9 mV</td>
<td align="center" bgcolor="#f9f9f9">5.0 mV</td>
<td align="center" bgcolor="#f9f9f9">9.2 mV</td>
<td align="center" bgcolor="#f9f9f9">Pass</td>
</tr></table>

Ripple/noise suppression is outstanding on all rails and throughout all loads. Andyson did a great job reducing ripple to the lowest possible. Even though the particular unit belongs to the mid-range price category it can easily compete with all high-end PSUs, at least in this field (ripple). Well done Andyson! Now it's time to check on these Voltage Regulation Modules and fix the voltage regulation issues.

Ripple at Full Load

In the following oscilloscope screenshots you can see the AC ripple and noise that the main rails registered (+12V, 5V, 3.3V and 5VSB). The bigger the fluctuations on the oscilloscope's screen the bigger the ripple/noise. For all measurements we set 0.01 V/Div (each vertical division/box equals to 0.01V) as standard.

http://www.techpowerup.com/reviews/I...load_small.jpg http://www.techpowerup.com/reviews/I...load_small.jpg http://www.techpowerup.com/reviews/I...load_small.jpg http://www.techpowerup.com/reviews/I...load_small.jpg

Ripple at Crossload 1

http://www.techpowerup.com/reviews/I..._cl1_small.jpg http://www.techpowerup.com/reviews/I..._cl1_small.jpg http://www.techpowerup.com/reviews/I..._cl1_small.jpg http://www.techpowerup.com/reviews/I..._cl1_small.jpg

Ripple at Crossload 2

http://www.techpowerup.com/reviews/I..._cl2_small.jpg http://www.techpowerup.com/reviews/I..._cl2_small.jpg http://www.techpowerup.com/reviews/I..._cl2_small.jpg http://www.techpowerup.com/reviews/I..._cl2_small.jpg

Value and Conclusion

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The In Win Commander II 750W retails for $98.99

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Good price/performance ratio
Excellent ripple/noise suppression
Even at full load at 45°C ambient the fan's noise wasn't annoying
All rails registered low voltage drops in Advanced Transient Response Tests
Five years warranty, something not so usual at this price range
In the bundle you will find a storing pouch for the unused modular cables

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40°C maximum operating temperature (however it worked flawlessly with full load at 45°C) and no Over Temperature Protection could be a fatal combination in chassis with poor airflow in conjunction with high load outputs
Loose voltage regulation at 3.3V and 5VSB
Low efficiency at <80W loads

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<th>8.6</th>
<td>First of all I admit that I quite like the whole military concept of the Commander units. Without any doubt they have a unique appearance which many modders will appreciate. Also the price of the IRP-COM750 II is quite good since at under $100 you get a modular 750W unit with good efficiency throughout 20-100% loads (but mediocre with under 80W), decent voltage regulation at +12V and ultra low ripple. In addition the unit is equipped with a ball-bearing fan which isn't annoying even at high loads and extreme operating temperatures and finally In Win supports it with five years warranty. On the other hand we would like to see much better voltage regulation at 3.3V and 5VSB rails and higher efficiency at low loads.<br/><br/>
In conclusion, I think that the price/performance ratio of the IRP-COM750 II is quite good, to say the least and if In Win/Andyson works out the problems we spotted then it will be even more competitive in the sub $100 category. Currently its stronger competitor is Corsair TX-750M which offers better voltage regulation on the minor rails, almost the same (lousy) efficiency at <100W loads, identical warranty period but also registers a little higher ripple levels. Also we should not forget the cost factor where In Win Commander II 750W clearly wins the TX-750M since it costs about $20 less.</td></tr>
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Introduction

Specifications

Cables & Connectors, Power Distribution

Packaging

Contents

Exterior

A Look Inside

Test Setup

Voltage Regulation Charts

5VSB Regulation Chart

Efficiency Chart

Voltage Regulation and Efficiency Measurements

Efficiency at Low Loads

5VSB Efficiency

Power Consumption in Idle & Standby

Cross Load Tests

+12V Voltage Regulation Chart

5V Voltage Regulation Chart

3.3V Voltage Regulation Chart

Efficiency Chart

+12V Ripple Chart

5V Ripple Chart

3.3V Ripple Chart

5VSB Ripple Chart

Advanced Transient Response Tests

Transient Response at 20% Load

Transient Response at 50% Load

Turn-On Transient Tests

Ripple Measurements

Ripple at Full Load

Ripple at Crossload 1

Ripple at Crossload 2

Value and Conclusion