Noise and Ripple
Noise and Ripple can easily be measured by an oscilloscope. These show how much voltage fluctuation there is on a particular rail. We tested the rail stability of the 3.3 volt, 5 volt and 12 volt rails using an identical time and millivolt scale for all graphs.
The latest ATX 12 volt version 2.3 specifications state that ripple from peak to peak must be no higher than 50 millivolts for the 3.3 volt and 5 volt rails, while the 12 volt rail is allowed up to 120 millivolts peak to peak to stay within specifications.
| Load (%) | 3.3V Ripple | 5V Ripple | 12V Ripple |
| 20 |  |  |  |
| 40 |  |  |  |
| 60 |  |  |  |
| 80 |  |  |  |
| 100 |  |  |  |
Over here XFX PSU’s generally tend to retail for a fair bit less than the Seasonic units they’re based upon. I wouldn’t hesitate to buy one if I were in the market and had to purchase my stuff.
As I own one of these units, I’ll say that the unit is extremely loud even at idle. It is the only audible thing in my computer and by audible I mean very loud. It’s not an annoying sound, but a constant air flow which is bothersome when the rest of the computer is close to silent.