Power Supply Roundup: 650W-680W

Comparison: DC Output Stability

Stable voltage output is what power supplies are designed to provide. They need to deliver the proper voltage to components so that they can function correctly. The higher the load gets, the more difficult it is for a power supply to deliver the desired voltage; this results in a constant voltage drop with increasing current. With the following graphs, we want to show the stability of these rails during operation. We show the range in which a power supply is able to provide the correct voltage. For these charts, we take the average deviation of all the measured results. The lower results indicate better compliance to regulations - i.e. less over- or undervolting on the rails - which means the PSU is better.

The unit from Hiper shows very good results, taking first place on the lower voltage rails. The deviation here is about 3%, which is very good and stable score. The other units aren't much worse, but they're still not as close to spec as the Hiper unit. With the 12V rails, things are slightly different. Here we have three power supplies rising above the rest. The units from be quiet!, Thermaltake, and Hiper are all within 1.57% of spec. In general, the regulation on the 12V rails runs much tighter with all of the units.