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 | 6.4 | 3.8 | 12.2 |
| 40 | 7.6 | 5 | 13.4 |
| 60 | 8.2 | 6.4 | 14 |
| 80 | 10.2 | 8.5 | 16.6 |
| 100 | 13.1 | 10 | 18.8 |
Given how the RM1000 fared in ripple suppression, let’s just say it wasn’t the greatest, I expected the HX1000i to be fairly average. It wasn’t. CWT have done an amazing job of boosting the ripple suppression capabilities of this unit allowing it to rival top-class OEMs like Super Flower, Seasonic, Flextronics and Delta.
3.3 volt @ 100%
5 volt @ 100%
12 volt @ 100%
Meet the all-new Kraken 240 All-in-one Liquid CPU Cooler from NZXT is perfect for systems…
Designed in collaboration with Capcom, the Street Fighter 6 - Ryu edition E-ATX MasterBox TD500…
The TH V2 ARGB Sync AIO Liquid Cooler series is the next generation model of…
SKY TWO is the second generation of the SKY series which is part of the…
A new fighter joined the game. The Hyper 212 Halo now features an exclusive Street…
80 PLUS PLATINUM CERTIFIED - An efficient power supply reduces system energy use & thermal…