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The following table includes the ripple levels we measured on the ST45SF's rails. The limits, according to the ATX specification, are 120mV (+12V) and 50mV (5V, 3.3V and 5VSB).
Ripple suppression is decent on every rail except 3.3V, where it exceeds 40mV under full load. To be fair, we did tax this small PSU with an almost-46°C operating temperature during the full load and overload tests.
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.