EVGA 850 B3 PSU Review

Ripple Measurements

To learn how we measure ripple, please click here.

The following table includes the ripple levels we measured on the rails of the 850 B3 unit. The limits, according to the ATX specification, are 120mV (+12V) and 50mV (5V, 3.3V and 5VSB).

Test12V5V3.3V5VSBPass/Fail
10% Load5.9mV9.0mV9.0mV12.5mVPass
20% Load7.6mV9.4mV9.7mV13.4mVPass
30% Load8.9mV11.2mV11.2mV13.7mVPass
40% Load8.8mV11.3mV13.1mV13.6mVPass
50% Load10.0mV11.1mV13.7mV14.3mVPass
60% Load10.9mV11.7mV15.0mV15.7mVPass
70% Load10.7mV13.5mV14.7mV16.9mVPass
80% Load11.9mV14.7mV17.2mV20.0mVPass
90% Load11.8mV17.8mV19.5mV18.7mVPass
100% Load14.0mV18.9mV19.9mV24.2mVPass
110% Load14.2mV20.2mV20.6mV25.8mVPass
Cross-Load 17.8mV10.7mV11.1mV14.6mVPass
Cross-Load 212.9mV17.1mV19.6mV21.3mVPass

Ripple suppression at +12V is great, and it's very good on the minor rails (particularly in light of the 850 B3's price tag). The extra ripple filtering caps on the cables surely play a role here.

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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