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Apexgaming AG-850M PSU Review

Ripple Measurements

To learn how we measure ripple, please click here.

The following table includes the ripple levels we measured on the AG-850M’s rails. The limits, according to the ATX specification, are 120mV (+12V) and 50mV (5V, 3.3V, and 5VSB).

Test12V5V3.3V5VSBPass/Fail
10% Load8.2mV11.7mV13.8mV26.9mVPass
20% Load14.0mV14.0mV15.9mV35.4mVPass
30% Load17.1mV14.9mV17.7mV35.4mVPass
40% Load18.6mV16.5mV18.4mV38.1mVPass
50% Load21.5mV17.6mV20.7mV51.7mVFail
60% Load23.0mV19.0mV22.0mV51.2mVFail
70% Load25.0mV20.4mV23.7mV60.2mVFail
80% Load26.7mV22.4mV25.5mV68.5mVFail
90% Load30.7mV24.1mV26.9mV66.0mVFail
100% Load37.3mV28.7mV31.7mV70.1mVFail
110% Load38.7mV28.9mV31.8mV74.6mVFail
Cross-Load 115.0mV31.4mV28.7mV41.6mVPass
Cross-Load 237.0mV24.5mV27.8mV76.8mVFail
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The first sample we tested had a problem with its 5VSB rail, where ripple was clearly out of control. Since we had a second sample at our disposal, we tested its ripple and measured significantly better performance. The following table shows the second AG-850M sample's ripple results.

Test12V5V3.3V5VSBPass/Fail
10% Load8.5mV13.2mV12.9mV5.6mVPass
20% Load16.1mV15.6mV15.4mV5.8mVPass
30% Load21.4mV17.0mV17.6mV6.5mVPass
40% Load25.7mV18.3mV19.3mV7.4mVPass
50% Load26.6mV20.5mV21.0mV8.9mVPass
60% Load30.4mV22.1mV23.0mV9.9mVPass
70% Load36.4mV23.9mV25.7mV10.6mVPass
80% Load39.2mV26.7mV29.2mV11.8mVPass
90% Load43.1mV28.7mV31.0mV13.2mVPass
100% Load53.5mV32.7mV36.3mV17.5mVPass
110% Load56.6mV34.4mV37.0mV17.8mVPass
Cross-Load 116.1mV30.0mV30.8mV12.0mVPass
Cross-Load 250.4mV25.7mV29.1mV16.2mVPass

The second sample fares much better in our 5VSB measurements. But that's not the case for all rails, particularly the always-critical +12V one.

Ripple Oscilloscope Screenshots

The following oscilloscope screenshots illustrate the AC ripple and noise registered on the main rails (+12V, 5V, 3.3V and 5VSB). We usually set 0.01 V/Div (each vertical division/box equals 0.01V), but in some cases we use a smaller setting as well, if the registered ripple is very low.

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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Aris Mpitziopoulos
Aris Mpitziopoulos is a Contributing Editor at Tom's Hardware US, covering PSUs.