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be quiet! SFX L Power 600W PSU Review

Ripple Measurements

To learn how we measure ripple, please click here.

The following table includes the ripple levels we measured on the SFX L Power 600W's rails. The limits, according to the ATX specification, are 120mV (+12V) and 50mV (5V, 3.3V and 5VSB).

Test12V5V3.3V5VSBPass/Fail
10% Load8.1mV8.0mV11.9mV6.0mVPass
20% Load10.7mV9.2mV14.0mV7.8mVPass
30% Load13.7mV11.0mV17.7mV8.8mVPass
40% Load17.3mV12.1mV18.6mV10.1mVPass
50% Load22.0mV14.6mV19.6mV11.7mVPass
60% Load27.6mV16.1mV21.7mV13.5mVPass
70% Load30.3mV17.8mV25.5mV15.3mVPass
80% Load36.1mV20.2mV27.6mV16.8mVPass
90% Load40.0mV21.4mV30.1mV19.2mVPass
100% Load45.9mV23.6mV31.9mV21.3mVPass
110% Load57.4mV25.2mV35.8mV23.8mVPass
Cross-Load 114.1mV13.7mV18.7mV11.1mVPass
Cross-Load 252.8mV21.9mV30.2mV18.8mVPass
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Ripple suppression on the +12V and 3.3V rails is average, while it's fairly good on the 5V and 5VSB rails. We would like to see below 40mV ripple at +12V under full load, and close to 25mV at 3.3V under the same conditions.

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

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Ripple At 110-Percent Load

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Ripple At Cross-Load 1

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Ripple At Cross-Load 2

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