Cooler Master GX 650W Bronze Review

Name: Cooler Master GX 650W Bronze
Brand: Cooler Master

crmaris

on Jun 22nd, 2011,

in Power Supplies.

Manufacturer: Cooler Master

Value & Conclusion »

Ripple Measurements

In the following table you will find the ripple levels that we measured on the main rails of GX650W Bronze. According to ATX specification the limits are 120 mV (+12V) and 50 mV (5V & 3.3V).

Ripple Measurements
Test	12 V	5 V	3.3 V	Pass/Fail
20% Load	13.2 mV	6.0 mV	5.8 mV	Pass
40% Load	21.2 mV	8.4 mV	6.6 mV	Pass
50% Load	24.8 mV	9.2 mV	6.8 mV	Pass
60% Load	28.2 mV	9.6 mV	6.8 mV	Pass
80% Load	36.8 mV	11.2 mV	6.2 mV	Pass
100% Load	47.8 mV	12.4 mV	5.2 mV	Pass
Crossload 1	31.4 mV	22.2 mV	8.6 mV	Pass
Crossload 2	43.0 mV	8.8 mV	3.8 mV	Pass

Ripple/noise suppression at minor rails is excellent. At +12V ripple is low enough and it doesn't exceed 50mV even at full load. Finally, it's quite strange that ripple at 3.3V, beyond 60% load, gets lower instead of increasing. As it seems this PSU is full of surprises!

Ripple at Full Load

In the following oscilloscope screenshots you can see the AC ripple and noise that the main rails registered (+12V, 5V, 3.3V). The bigger the fluctuations on the oscilloscope's screen the bigger the ripple/noise. We set 0.01 V/Div (each vertical division/box equals to 0.01V) as standard but sometimes we are forced to use 0.02 V/Div, meaning that the fluctuations will look smaller but actually this wont be the case.