Test SetupAll measurements are performed utilizing nine electronic loads (six Array 3711A, 300W each, and three Array 3710A, 150W each), which are able to deliver over 2000W of load and are controlled by a custom made software. We also use a DS1M12 (Stingray) 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 two more oscilloscopes (Rigol 1052E and VS5042) 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.
Voltage Regulation ChartsThe following charts show the voltage values of the main rails, recorded over a range from 70W to the maximum specified load, and the deviation (in percent) for the same load range.
Efficiency ChartIn this chart you will find the efficiency of EMR1350EWT at low loads and at loads equal to 20-120% of PSU’s maximum rated load.
Voltage Regulation and Efficiency MeasurementsThe first set of tests reveals the stability of voltage rails and the efficiency of EMR1350EWT. 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.
| Voltage Regulation & Efficiency Testing Data |
|Test||12 V||5 V||3.3 V||Power|
We took the plunge and pushed the EMR1350EWT up to its peak power! Currently it is the strongest PSU we have ever tested with both of our setups, the old resistor based loader and the new shiny electronic loads. The previous wattage king was a Silverstone ST-1500 that went up to 1608W DC and now the middle member of the MaxRevo series handled 1620W of load with ease. However we should note here that the manufacturer gives 1620W as the peak power the unit can handle and although we have applied this power for quite long (over ten minutes) in order to be sure that voltage levels on all rails and ripple readings were normal, we don't recommend overpowering not only the EMR1350EWT but every PSU because you risk destroying the PSU and possibly whole system. If you need a stronger PSU then you better get one with more capacity.
After picking our jaw off the floor, because of the unit's 1620W real peak power, let's analyze the rest of the data that the above table shows. Efficiency is very high, especially for a 1350W PSU, even with the ultra high temperatures we used for all tests. Enermax managed to easily reach Gold efficiency levels in a such a high capacity unit without even utilizing an LLC-resonant topology. This is impressive to say the least!
However all good things in this world come at a price and in this case the price is reflected in the loose voltage regulation on all rails. Even at +12V we have over 4% deviation. We are used to see much better voltage regulation on this rail, even with mid-range power supplies. Nevertheless all rails managed to stay within 5% range, even at peak load. Finally, as you can see from the 20% load test, the unit starts all voltages at increased levels on all rails. We are pretty sure that Enermax deliberately tuned the unit to do so, in order to prevent the rails from dropping their voltages too much at higher loads.
Efficiency at Low LoadsIn the next tests, we measure the efficiency of EMR1350EWT 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, 70 and 100W. This is important for scenarios in which a typical office PC is in idle with power saving turned on.
| Efficiency at Low Loads |
|Test #||12 V||5 V||3.3 V||Power|
We don't think that anyone would expect a sumo wrestler to be able to dance like a ballerina. Guess what? The same goes for the EMR1350EWT at very low loads, like the ones we tried. Only at 100W load the 80% mark is, barely, surpassed. But as we stated above we can't really blame a 1350W beast for low efficiency at 40W and 70W loads. If you need such a high capacity PSU then your system will have much higher power consumption even at idle.
5VSB EfficiencyATX 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.
| 5VSB Efficiency|
|Test #||5VSB||Power (DC/AC)||Efficiency||PF/AC Volts|
Efficiency at 5VSB is very good and surpasses the ATX spec recommended thresholds by far.
Power Consumption in Idle & StandbyIn 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).
| Idle / Standby |
|Mode||12 V||5 V||3.3 V||5VSB||Power (AC)||PF/AC Volts|
Despite its huge capacity it only requires 0.25W at standby, so it easily meets the ErP Lot 6 2010 requirements for less than 1W AC power draw. Also you can see the very high initial voltages of all rails. Especially the 3.3V rail exceeds the upper ATX limit. However the PSU is not going to work at idle in a real system, since it will always have a load on its rails, so you have nothing to worry about.