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Corsair RM550x Power Supply Review

The lowest-capacity unit Corsair's RMx line outputs up to 550W and is 80 PLUS Gold-certified. It features fully modular cabling, offers great performance and is nearly silent throughout its operating range, too.

Ripple Measurements

To learn how we measure ripple, please click here.

The following table includes the RM550x's ripple levels. The limits, according to the ATX specification, are 120mV (+12V) and 50mV (5V, 3.3V and 5VSB).

Test12V5V3.3V5VSBPass/Fail
10% Load4.2mV7.0mV5.2mV8.3mVPass
20% Load4.8mV7.2mV5.3mV8.0mVPass
30% Load5.4mV7.3mV5.4mV8.1mVPass
40% Load6.3mV7.3mV5.9mV8.1mVPass
50% Load7.0mV7.6mV5.9mV8.5mVPass
60% Load7.4mV7.8mV7.2mV8.5mVPass
70% Load7.0mV8.0mV8.2mV8.6mVPass
80% Load7.5mV7.9mV9.1mV8.8mVPass
90% Load8.2mV8.2mV9.4mV9.5mVPass
100% Load8.9mV9.2mV11.3mV10.3mVPass
110% Load9.6mV9.2mV12.5mV10.5mVPass
Cross-Load 16.3mV8.4mV7.4mV9.2mVPass
Cross-Load 28.7mV8.8mV12.2mV9.3mVPass
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Ripple performance is jaw-dropping! The RM550x easily matches Super Flower's high-end platforms. Corsair uses every trick in the book to offer the lowest possible ripple, and its results justify that effort.

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 0.01V/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 is a Contributing Editor at Tom's Hardware US, covering PSUs.