Enermax D.F. 500W PSU Review

Ripple Measurements

To learn how we measure ripple, please click here.

The following table includes the ripple levels we measured on the EPF500AWT's rails. The limits, according to the ATX specification, are 120mV (+12V) and 50mV (5V, 3.3V and 5VSB).

Test12V5V3.3V5VSBPass/Fail
10% Load17.0mV9.4mV9.1mV9.7mVPass
20% Load21.0mV10.8mV11.4mV9.8mVPass
30% Load23.7mV13.8mV12.8mV10.8mVPass
40% Load26.0mV16.4mV14.0mV19.3mVPass
50% Load28.7mV18.4mV15.3mV14.3mVPass
60% Load30.5mV19.2mV17.0mV15.8mVPass
70% Load33.1mV18.6mV18.5mV17.6mVPass
80% Load37.9mV23.9mV20.2mV19.0mVPass
90% Load38.9mV26.6mV21.3mV19.3mVPass
100% Load41.6mV29.5mV25.4mV21.3mVPass
110% Load43.0mV29.8mV26.5mV21.4mVPass
Cross-Load 129.3mV16.6mV19.9mV11.5mVPass
Cross-Load 234.8mV23.7mV20.9mV15.4mVPass

Ripple suppression is satisfactory at +12V and pretty good at 5VSB. The minor rails fare well enough, but they really should be even better in such an expensive PSU.

Ripple Oscilloscope Screenshots

The following oscilloscope screenshots illustrate the AC ripple and noise registered on the main rails (+12V, 5V, 3.3V and 5VSB). The bigger the fluctuations on the screen, the bigger the ripple/noise. We set 0.01 V/Div (each vertical division/box equals 0.01V) as the standard for all measurements.

Ripple At Full Load

Ripple At 110-Percent Load

Ripple At Cross-Load 1

Ripple At Cross-Load 2

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