Corsair RM750x PSU Review: Improving On A Classic
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Ripple Measurements
To learn how we measure ripple, please click here.
The following table includes the ripple levels we measured on the RM750x’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 | 3.5mV | 3.3mV | 7.0mV | 4.2mV | Pass |
20% Load | 4.9mV | 4.1mV | 7.8mV | 4.8mV | Pass |
30% Load | 7.7mV | 3.9mV | 8.1mV | 4.8mV | Pass |
40% Load | 7.4mV | 7.3mV | 9.5mV | 8.4mV | Pass |
50% Load | 7.3mV | 6.5mV | 9.1mV | 6.9mV | Pass |
60% Load | 6.3mV | 4.1mV | 8.3mV | 5.1mV | Pass |
70% Load | 6.9mV | 4.5mV | 8.6mV | 5.4mV | Pass |
80% Load | 7.0mV | 5.7mV | 8.5mV | 6.4mV | Pass |
90% Load | 7.1mV | 6.0mV | 10.7mV | 7.0mV | Pass |
100% Load | 7.3mV | 5.4mV | 10.1mV | 6.5mV | Pass |
110% Load | 8.0mV | 6.9mV | 13.9mV | 14.7mV | Pass |
Cross-Load 1 | 9.9mV | 5.9mV | 10.7mV | 6.0mV | Pass |
Cross-Load 2 | 7.7mV | 6.2mV | 10.0mV | 7.5mV | Pass |
Ripple suppression on all of the rails was excellent. Corsair's good design, along with in-cable capacitors, got the job done.
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.
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joedavies87 I bought one last year and did not realize that I would need two EPS cables for future builds. Moved to EVGA. Corsair was too late.Reply