Cooler Master G550M 550 W Review

Name: Cooler Master G550M 550 W
Brand: Cooler Master

crmaris

on Dec 6th, 2013,

in Power Supplies.

Manufacturer: Cooler Master

Performance Rating, Performance per Dollar & Noise Rating »

Ripple Measurements

You will see the ripple levels we measured on the main rails of the G550M 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 - Cooler Master G550M
Test	12 V	5 V	3.3 V	5VSB	Pass/Fail
20% Load	10.2 mV	4.6 mV	8.0 mV	8.4 mV	Pass
40% Load	13.3 mV	5.8 mV	8.4 mV	11.3 mV	Pass
50% Load	17.8 mV	6.5 mV	10.6 mV	11.5 mV	Pass
60% Load	19.2 mV	6.3 mV	9.8 mV	11.8 mV	Pass
80% Load	22.2 mV	8.1 mV	12.2 mV	15.4 mV	Pass
100% Load	27.3 mV	8.3 mV	13.1 mV	16.6 mV	Pass
110% Load	30.4 mV	8.9 mV	14.8 mV	16.8 mV	Pass
Crossload 1	19.2 mV	6.9 mV	9.3 mV	8.2 mV	Pass
Crossload 2	22.8 mV	6.5 mV	10.2 mV	10.7 mV	Pass

Ripple suppression was absolutely fantastic on all rails! CWT did a marvelous job here, and all rails on this PSU are super clean. This is performance we would normally expect from a high-end PSU, not a mid-range one. The CapXon caps will hopefully keep their good performance after some time of use instead of aging too quickly.

Ripple at Full Load

You can see the AC ripple and noise the main rails registered (+12V, 5V, 3.3V, and 5VSB) in the following oscilloscope screenshots. The bigger the fluctuations on the oscilloscope's 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.