SilverStone SX650-G PSU Review: Lots Of Power In A Small Form Factor

Ripple Measurements

To learn how we measure ripple, please click here.

The following table includes the ripple levels we measured on the SX650-G’s rails. The limits, according to the ATX specification, are 120mV (+12V) and 50mV (5V, 3.3V, and 5VSB).

Test12V5V3.3V5VSBPass/Fail
10% Load14.5mV12.0mV14.2mV13.1mVPass
20% Load58.7mV22.4mV14.3mV17.1mVPass
30% Load31.4mV26.1mV19.4mV25.0mVPass
40% Load29.3mV32.5mV20.0mV22.8mVPass
50% Load29.7mV29.1mV20.7mV24.6mVPass
60% Load29.8mV28.1mV25.3mV26.1mVPass
70% Load31.7mV31.3mV27.5mV33.0mVPass
80% Load34.1mV32.6mV28.5mV30.0mVPass
90% Load38.4mV32.2mV30.7mV32.6mVPass
100% Load44.4mV32.8mV33.0mV29.6mVPass
110% Load43.8mV28.7mV31.0mV28.8mVPass
Cross-Load 160.2mV25.2mV24.6mV33.7mVPass
Cross-Load 241.4mV27.9mV25.6mV25.1mVPass

The ripple suppression we measured is decent for an SFX power supply. In such a small platform, there isn't much space for extra filtering capacitors. Although it'd probably be a good idea to use cables with built-in caps, we don't like the extra bulk that those cable create.

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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