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The following table includes the ripple levels we measured on the 650 GM’s rails. The limits, according to the ATX specification, are 120mV (+12V) and 50mV (5V, 3.3V, and 5VSB).
The ripple suppression we observe is not up to today's high-end standards. It's good enough, though, especially when we take into account that this is an SFX-based power supply. Still, it'd be nice to see close to 30mV ripple at +12V and below 20mV on the minor rails under full load.
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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Aris Mpitziopoulos is a Contributing Editor at Tom's Hardware US, covering PSUs.
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