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. millivolt ripple is measured by the peak to peak size of the voltage curve.
Sample Ripple Graph
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. Millivolt figures are stated to the closest increment of 5 given their variability.
| Load (%) | 3.3V Ripple | 5V Ripple | 12V Ripple |
| 20 | 3.2 | 4 | 12.4 |
| 40 | 4.4 | 6.2 | 13.2 |
| 60 | 6.2 | 9 | 13.6 |
| 80 | 7 | 9.2 | 16 |
| 100 | 8 | 11.4 | 17.4 |
Ripple suppression is exceptional: this easily rivals the best power supply units on the market. Thermaltake’s Toughpower DPS 750W shows why digital power supplies are so sought after.
3.3 volt @ 100%
5 volt @ 100%
12 volt @ 100%
How to Play: Draw cards and try to avoid the dreaded Exploding Kitten! Use strategic…
32-inch 4K (3840 x 2160) QD-OLED gaming monitor with 240 Hz refresh rate and 0.03…
Developed by Treyarch and Raven, Call of Duty: Black Ops 6 is a spy action…
Square Enix has just given us some great news, as it looks like PC gamers…
A new patch for Horizon Zero Dawn Remastered has arrived, bringing a host of fixes,…
Biostar has just announced a new line of DDR4 memory modules designed for gamers and…