Seasonic Focus Plus Gold 850 PSU Review

Ripple Measurements

To learn how we measure ripple, please?click here.

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

Test12V5V3.3V5VSBPass/Fail
10% Load7.0mV5.2mV3.6mV2.8mVPass
20% Load10.4mV6.1mV4.5mV3.5mVPass
30% Load13.3mV6.6mV5.0mV4.3mVPass
40% Load15.2mV7.7mV5.7mV4.7mVPass
50% Load15.7mV9.2mV6.7mV4.7mVPass
60% Load15.1mV9.9mV7.3mV5.8mVPass
70% Load16.5mV10.2mV7.8mV5.8mVPass
80% Load18.3mV10.4mV8.7mV8.7mVPass
90% Load21.2mV11.2mV9.0mV9.1mVPass
100% Load24.2mV12.3mV9.5mV9.8mVPass
110% Load26.9mV12.7mV9.7mV9.9mVPass
Cross-Load 18.4mV10.6mV7.8mV3.3mVPass
Cross-Load 224.0mV7.9mV5.8mV7.2mVPass

Ripple suppression is great on every rail. Seasonic does a great job here, though we'd prefer to see this performance without the use of extra filtering caps on the modular cables.

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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