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.
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 | 6.2 | 5 | 11.4 |
40 | 10.4 | 6 | 15.6 |
60 | 12 | 7.2 | 21 |
80 | 14.4 | 9 | 24.8 |
100 | 15 | 10 | 27.8 |
Ripple on this unit was much lower than I expected, with good regulation across all of the rails. I’ve seen units of this output do better, but more often than not, they’re much more expensive units. Either way, these are good results.
3.3 volt @ 100%
5 volt @ 100%
12 volt @ 100%
TKL mechanical keyboard with 88 keys in a UK ISO layout V-silk PBT keycaps with…
Following on from the success of their Black Edition series earlier this year, noblechairs now…
Storage PortsM.2 PCIe 4.0 x42SATA 6G (internal)4ColourPrimary ColourBlackWiFi & LANLAN ports1x 2.5 Gbit/sLightingLightingYesLighting ColourRGBForm FactorMotherboard…
330 degrees manual rotatable design. Free to adjust your preferred orientation. Tube diameter 5.1 mmØ…
The S100 Tempered Glass mid-tower chassis combines sophistication and elegance in a modern steel case…
Expand your handheld gaming device or M.2 2230 compatible laptop’s storage with the WD_BLACK SN770M…