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Corsair SF450 Platinum SFX PSU Review


To learn how we measure ripple, please click here.

The following table includes the ripple levels we measured on the SF450’s rails. The limits, according to the ATX specification, are 120mV (+12V) and 50mV (5V, 3.3V, and 5VSB).

Test 12V 5V 3.3V 5VSB Pass/Fail
10% Load 5.5 mV 6.8 mV 4.5 mV 7.6 mV Pass
20% Load 8.5 mV 7.2 mV 5.3 mV 9.2 mV Pass
30% Load 11.0 mV 7.6 mV 5.6 mV 9.0 mV Pass
40% Load 12.7 mV 7.9 mV 6.2 mV 8.6 mV Pass
50% Load 15.2 mV 8.7 mV 6.8 mV 8.7 mV Pass
60% Load 26.5 mV 9.4 mV 8.7 mV 11.3 mV Pass
70% Load 18.9 mV 10.2 mV 10.2 mV 10.2 mV Pass
80% Load 19.9 mV 11.0 mV 11.7 mV 11.2 mV Pass
90% Load 21.7 mV 11.3 mV 11.1 mV 12.5 mV Pass
100% Load 23.3 mV 12.0 mV 11.1 mV 13.6 mV Pass
110% Load 25.8 mV 12.1 mV 10.9 mV 14.7 mV Pass
Crossload 1 9.9 mV 11.6 mV 11.2 mV 15.6 mV Pass
Crossload 2 23.6 mV 8.1 mV 6.8 mV 15.0 mV Pass


The ripple suppression is very good on all rails. You shouldn’t expect to find the below 10mV readings that the high-end ATX units achieve, since the available space in the secondary side is limited in SFX units and Corsair didn’t use in-cable caps. In any case though, 23.3mV of ripple at +12V under full load at 47°C is top-notch performance.

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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