Corsair RM Series 750 W Review

Name: Corsair RM Series 750 W
Brand: Corsair

crmaris

on Oct 17th, 2013,

in Power Supplies.

Manufacturer: Corsair

Performance Rating, Performance per Dollar & Noise Rating »

Ripple Measurements

You will see the ripple levels we measured on the main rails of the RM750 in the following table. The limits are, according to the ATX specification, 120 mV (+12V) and 50 mV (5V, 3.3V, and 5VSB).

Ripple Measurements Corsair RM750
Test	12 V	5 V	3.3 V	5VSB	Pass/Fail
20% Load	11.7 mV	16.6 mV	12.9 mV	14.9 mV	Pass
40% Load	15.4 mV	19.2 mV	14.9 mV	15.9 mV	Pass
50% Load	15.6 mV	21.9 mV	17.9 mV	15.2 mV	Pass
60% Load	23.0 mV	23.6 mV	24.2 mV	16.5 mV	Pass
80% Load	25.6 mV	25.4 mV	29.0 mV	17.1 mV	Pass
100% Load	35.3 mV	26.8 mV	32.1 mV	20.7 mV	Pass
110% Load	41.7 mV	32.6 mV	38.5 mV	20.7 mV	Pass
Crossload 1	17.7 mV	22.1 mV	43.5 mV	11.4 mV	Pass
Crossload 2	32.3 mV	22.0 mV	27.2 mV	20.3 mV	Pass

Ripple suppression on the +12V rail was excellent and good enough on the other rails, though definitely not topnotch. We actually noticed the 3.3V rail registering very high ripple close to the 50 mV limit a few times during our automatically programmed Cross Load test dialing thousands of possible load combinations. Check the following scope shots and you will notice a few spikes that somehow managed to escape the filtering capacitors of the secondary side on this rail.

Ripple at Full Load

In the following oscilloscope screenshots, you can see the AC ripple and noise the main rails registered (+12V, 5V, 3.3V, and 5VSB). The bigger the fluctuations on the oscilloscope screen, the bigger the ripple/noise. For all measurements, we set 0.01 V/Div (each vertical division/box equals 0.01 V) as standard.