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Corsair RM750i Power Supply Review

Corsair is revamping its RM line, adding the letter "i" to highlight a more advanced digital interface — today we check out the RM750i.

Ripple Measurements

To learn how we measure ripple, please click here.

The following table includes the ripple levels we measured on the rails of the RM750i unit. The limits, according to the ATX specification, are 120mV (+12V) and 50mV (5V, 3.3V and 5VSB).

Test12V5V3.3V5VSBPass/Fail
10% Load5.3mV9.1mV12.7mV4.9mVPass
20% Load6.5mV8.7mV13.8mV4.7mVPass
30% Load6.8mV8.9mV15.5mV5.3mVPass
40% Load8.4mV9.6mV17.1mV5.8mVPass
50% Load9.4mV8.9mV15.4mV6.5mVPass
60% Load10.6mV9.4mV16.6mV7.6mVPass
70% Load11.6mV9.8mV17.0mV7.9mVPass
80% Load13.1mV10.4mV16.6mV8.6mVPass
90% Load14.6mV10.7mV18.3mV9.3mVPass
100% Load16.5mV12.0mV19.9mV11.4mVPass
110% Load18.4mV11.9mV20.6mV12.8mVPass
Cross-Load 18.0mV9.5mV14.4mV6.6mVPass
Cross-Load 216.1mV11.5mV20.1mV9.4mVPass

Overall, ripple suppression is very good with the +12V rail, which is the most significant of all, registering the second-best performance in this category and surpassing even the high-end Seasonic Snow Silent-750. Only Super Flower's Leadex platform, used in the EVGA 750 G2 unit — which is, indeed, ripple-proof — managed to register a better performance here and take the lead.

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

Ripple At 110-Percent Load

Ripple At Cross-Load 1

Ripple At Cross-Load 2

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