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Corsair HX850 PSU Review

Ripple Measurements

To learn how we measure ripple, please click here.

The following table includes the ripple levels we measured on the HX850's rails. The limits, according to the ATX specification, are 120mV (+12V) and 50mV (5V, 3.3V and 5VSB).

Test12V5V3.3V5VSBPass/Fail
10% Load5.7mV6.6mV8.4mV5.5mVPass
20% Load7.0mV6.1mV8.6mV5.3mVPass
30% Load8.2mV7.1mV8.7mV6.6mVPass
40% Load8.7mV6.8mV9.7mV6.0mVPass
50% Load9.7mV7.5mV11.3mV8.3mVPass
60% Load11.0mV6.7mV10.7mV8.2mVPass
70% Load9.9mV7.3mV10.8mV8.5mVPass
80% Load10.2mV7.4mV11.4mV8.8mVPass
90% Load11.2mV8.0mV13.6mV10.0mVPass
100% Load14.1mV9.9mV12.4mV12.0mVPass
110% Load14.8mV10.4mV13.1mV13.5mVPass
Cross-Load 19.4mV10.6mV9.6mV9.8mVPass
Cross-Load 212.8mV8.4mV11.8mV10.8mVPass
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These numbers reflect excellent ripple suppression! A solid design and those extra in-cable capacitors work wonders in our 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

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Ripple At 110-Percent Load

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Ripple At Cross-Load 1

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Ripple At Cross-Load 2

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Aris Mpitziopoulos
Aris Mpitziopoulos is a Contributing Editor at Tom's Hardware US, covering PSUs.