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 | 3mV | 4mV | 10.2mV |
| 40 | 3.4mV | 4.4mV | 14.8mV |
| 60 | 3.6mV | 5mV | 23.4mV |
| 80 | 4mV | 7.4mV | 25.4mV |
| 100 | 7.2mV | 12mV | 32.8mV |
The ripple results speak volumes about the Seasonic OEM design used. All major rails had excellent performance and kept well within ATX specs. Check out the 100% load shots below:
3.3 volts @ 100%
5 volts @ 100%
12 volts @ 100%
AMD has announced the upcoming FidelityFX Super Resolution 4 (FSR 4) technology, leveraging AI to…
The CORSAIR iCUE H100i ELITE CAPELLIX XT Liquid CPU Cooler provides powerful, high-performance cooling for…
The Verbatim Portable Monitor gives you an extra dimension for your work and play. You…
With years of experience, MSI is no stranger to building high-performance motherboards. Their R&D and…
CORSAIR VENGEANCE RGB PRO Series DDR4 memory illuminates your system with captivating dynamic multi-zone RGB…
Edifier MG300 Bluetooth speaker is complete with RGB cool lighting effect, unique design with simple…