Testing was done using Motherboard Monitor. Idle voltages were measured while the computer was doing nothing but sitting at the Windows desktop while load voltages were measured after running 3dMark 2001 SE for no less than 10 full iterations. There are no -12V or -5V readings because the motherboard did not support reading them.

Test System

First up is the Demon 480W PSU

As you can see from the picture above, the 480W runs pretty close to the specs, being within ±.1V for the +3.3V and +5.00V lines. The +12.00V line does run a little high at 12.38V however, this is not a drastic variance.

After running the computer hard for about 2 hours, we can see that the voltages have remained relatively steady. The +3.3V line barely moved, moving only .02V during the entire gauntlet of activity. The +5.00V line also moved minutely, going up ±.03V. The +12.00V line moved the most out of the three, though it also moved only ±.08V.

Now for the Demon 580W PSU

From the averages of the 580W PSU, we can see that the lines all run slightly above spec, though not by much. There is quite a bit of jumping around on both the +5.00V and +12.00V lines even though the computer is idling. The +5.00V line moves a miniscule ±.12V. The +12.00V line however jumps around from 12.07 to 12.32, a jump of about .25V. Again, though this is small and within the tolerances of the power supplies, it is the largest jump of either of the power supplies.

After a grueling 40 minute run, the numbers from the power supply show that, though it did fluctuate slightly, it is no greater than when it was idle. The +5.00V average is lower than it was when idle while the +12.00V line is slightly higher than idle ranges. Both numbers however, are trivial as the change is not enormous.