Seasonic SSR-650PX PSU Review: High Performance Without Breaking The Bank

Ripple Measurements

To learn how we measure ripple, please click here.

The following table includes the ripple levels we measured on the SSR-650PX’s rails. The limits, according to the ATX specification, are 120mV (+12V) and 50mV (5V, 3.3V, and 5VSB).

Test12V5V3.3V5VSBPass/Fail
10% Load8.1mV4.8mV3.7mV3.9mVPass
20% Load11.7mV5.6mV4.3mV4.3mVPass
30% Load14.3mV6.0mV4.9mV4.4mVPass
40% Load17.0mV6.5mV5.6mV4.7mVPass
50% Load19.0mV7.9mV6.5mV4.9mVPass
60% Load20.4mV9.3mV7.1mV5.4mVPass
70% Load22.1mV10.4mV8.2mV7.2mVPass
80% Load22.4mV10.9mV9.0mV9.5mVPass
90% Load23.4mV9.9mV9.0mV9.8mVPass
100% Load24.5mV11.0mV9.4mV8.1mVPass
110% Load26.7mV11.5mV9.7mV8.9mVPass
Cross-Load 110.6mV9.5mV8.4mV5.2mVPass
Cross-Load 224.9mV8.2mV5.6mV7.8mVPass

The ripple suppression on every rail is very good. This platform's design, along with the extra filtering caps in the modular cables, make these results possible.

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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