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 | 4.6 | 5.4 | 8 |
40 | 7.4 | 7.6 | 10.4 |
60 | 11 | 10.2 | 10.6 |
80 | 15.6 | 14 | 12.4 |
100 | 16.6 | 17.2 | 13.4 |
It’s near impossible to find a PSU these days that fail this test and the 1000W unit I’m testing today passes with ease; we’ve seen better performance, but it’s certainly not bad either.
3.3 volt @ 100%
5 volt @ 100%
12 volt @ 100%
SpecificationsHeadphone TypeClosed BackStyleOver EarDriver TypeDynamicHeadphone Connector Type3.5mm JackIncludes AdaptorYesImpedancen/a OhmMicrophoneNoDetachable CableNoCable Length1.5 mWeight320 gSensitivity0 dB/mW…
Keyboard ModelTUF Gaming K1Form FactorStandard Full SizeKey SwitchesTactile TUF Gaming SwitchesWired/WirelessWiredConnectivityUSB 2.0Rechargeable BatteryNoBattery Type USB HubN/AWrist…
SABRENT has today revealed their new USB-C Hub featuring 7 ports including up to 20W…
Immersive Gaming Experience: Perfect for PlayStation 5, PS4 and PC gaming titles, the Driving Force…
Size / Capacity32GBMemory ModelVengeance RGB PRO BlackMax. Memory Channels Provided by KitDual (2)Memory TypeDDR4Memory Type…
Core Chassis SpecificationsCase EditionPop Air RGB BlackCase Form FactorMid TowerMotherboard Form FactorATXMicroATXMini-ITX I/O, Bays &…