We would like to thank Rosewill for supplying the review sample.
This is not our first Tachyon PSU review as we actually tested this series' flagship, the Tachyon-1000, several months ago. It managed to impress us enough to be awarded our Editor’s Choice badge, but it is now time for the second-strongest unit of the line, the Tachyon-750, to prove its worth. We will figure out whether it can compete with the competition's recently released products for this category. You see, while the Platinum platform the Tachyon-750 utilizes is made by a respectable manufacturer, it has also been around for a pretty long time, and Super Flower recently released their second generation Platinum platform with the Leadex units. It'll be interesting to see how SF’s older design stands up against the competition's new designs because the Tachyon-750 is currently also priced similarly to other high-end PSUs in its category.
The Tachyon-750 is 80 Plus Platinum certified, utilizes a semi-modular cabling design with normal wires, has a single +12V rail, and is backed by a seven-year warranty. According to Rosewill, it can also deliver its full power continuously at up to 50°C ambient, which means that its internal components have the necessary tolerance to handle heavy abuse. With four PCIe connectors, this unit looks like the ideal candidate for a mid-level system with two VGAs, but only finishing all of our test sessions will give us the complete picture, whereupon we will either recommend it or not.
|Tachyon-750 Features & Specs|
|Max. DC Output||750W|
|Efficiency||80 PLUS Platinum|
|Intel Haswell Ready||Yes|
|Operating temperature||0°C - 50°C|
|Protections||Over Voltage Protection|
Under Voltage Protection
Over Power Protection
Over Current Protection
Short Circuit Protection
|Cooling||140 mm Sleeve Bearing Fan (RL4Z S1402512HH)|
|Dimensions||150 mm (W) x 86 mm (H) x 173 mm (D)|
|Compliance||ATX12V v2.30, EPS 2.92|
|Price at time of review (exc. VAT)||$179.99|
Efficiency is Platinum, and the Tachyon-750 can deliver its maximum power continuously at up to 50°C, which is as the ATX spec recommends. Unfortunately, OTP (Over Temperature Protection) is missing from among its available protections, and the unit can't operate semi-passively, which would have been ideal for such a highly efficient PSUs.
The fan is strangely enough of a lower quality since it uses a sleeve-bearing instead of ball-bearings or FDB. We expect a high-end PSU of nearly $200 to come with a better fan, but you will be covered by Rosewill's seven-year warranty if the fan breaks. Finally, with a length of 173 mm, the dimensions of the unit are a little larger than normal.
|Tachyon-750 Power Specs|
|Total Max. Power||750W|
The single +12V rail can deliver up to 62 A, making it quite strong. The minor rails have SF's typical 100 W capacity combined, which will suffice because most modern systems depend heavily on the +12V rail for today's PC components. Its 5VSB rail can put out a maximum of 2.5 A, which is the standard value for most PSUs today.
Cables & Connectors, Power Distribution
|ATX connector (580mm)||20+4 pin|
|4+4 pin EPS12V/ATX12V (620mm)||1|
|8 pin EPS12V (620mm)||1|
|6+2 pin PCIe (590mm+130mm)||2|
|6+2 pin PCIe (500mm)||2|
|4 pin Molex (500mm+130mm+130mm)||3|
|4 pin Molex (500mm+130mm) / FDD(+130mm)||2 / 1|
The unit comes with enough connectors for its capacity, though we have lately seen high-end 750 W and 760 W units with six PCIe connectors. That said, three power-hungry VGAs should really be fed by something stronger, especially if your system is highly overclocked.
The main ATX cable should ideally be 60 cm long, and both EPS connectors should at least be 65 cm long. The distance among connectors is good, though we would like to see two or more centimeters on the 4-pin Molex connectors. Finally, the longer of the two EPS cables uses thicker 16AWG gauges for lower voltage drops at higher loads; the same applies to the wires that deliver +12V and earth to the main ATX connector. All the other connectors use normal 18AWG wires.
We have nothing to comment on about the power distribution of this PSU because it only features a single +12V rail.
The package is of medium size and features a plastic handle on top. The front has an image of the PSU with the fan grill in the foreground. Next to it are the model description and a series badge for its modular cables, Platinum efficiency, and warranty. While Rosewill states that this unit has a five-year warranty, it is said to have seven years on Newegg's product page. They probably decided to offer two additional years, but couldn't change the information on the package in time.
The sides only have the series description and Rosewill's name.
Here are a features list, four tables with power specifications, and a table describing all available connectors.
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