Cooler Master GX III 750W ATX v3.0 PSU Review

Load Regulation

Test 12V 5V 3.3V 5VSB DC/AC (Watts) Efficiency Fan Speed (RPM) PSU Noise (dB[A]) Temps (In/Out) PF/AC Volts
10% 4.436A 1.978A 1.957A 0.986A 75 89.779% 0 <6.0 44.69C 0.972
12.038V 5.056V 3.372V 5.073V 83.573 40.43C 114.85V
20% 9.892A 2.973A 2.945A 1.187A 149.92 92.24% 0 <6.0 45.46C 0.987
12.032V 5.046V 3.361V 5.055V 162.544 40.89C 114.83V
30% 15.705A 3.474A 3.446A 1.389A 224.907 92.587% 0 <6.0 46.41C 0.993
12.025V 5.037V 3.352V 5.037V 242.881 41.41C 114.8V
40% 21.532A 3.978A 3.95A 1.594A 299.983 92.132% 768 24.1 41.97C 0.995
12.018V 5.027V 3.342V 5.019V 325.599 47.52C 114.77V
50% 26.968A 4.986A 4.958A 1.801A 374.362 91.466% 848 27.0 42.21C 0.997
12.009V 5.014V 3.328V 4.997V 409.272 48.22C 114.75V
60% 32.460A 5.999A 5.972A 2A 449.291 90.74% 1007 31.4 42.79C 0.997
12.000V 5.002V 3.316V 4.977V 495.16 49.34C 114.72V
70% 37.957A 7.015A 6.993A 2.22A 524.294 89.92% 1120 33.9 43.37C 0.997
11.992V 4.99V 3.303V 4.956V 583.114 50.43C 114.7V
80% 43.519A 8.001A 8.018A 2.326A 599.297 89.045% 1262 36.7 43.92C 0.997
11.984V 4.979V 3.292V 4.943V 672.97 51.98C 114.66V
90% 49.424A 8.551A 8.531A 2.434A 674.455 88.107% 1436 39.7 44.00C 0.997
11.977V 4.969V 3.282V 4.93V 764.904 53.09C 114.56V
100% 55.139A 9.073A 9.081A 3.069A 749.661 87.008% 1631 42.6 45.14C 0.997
11.969V 4.959V 3.271V 4.887V 861.625 55.20C 114.6V
110% 60.732A 10.106A 10.221A 3.075A 824.671 85.772% 1812 44.9 46.67C 0.998
11.960V 4.947V 3.258V 4.878V 961.472 57.55C 114.57V
CL1 0.115A 14.422A 14.331A 0A 121.279 84.21% 822 26.4 39.99C 0.985
12.019V 5.006V 3.328V 5.108V 144.016 45.48C 114.83V
CL2 0.114A 19.953A 0A 0A 101.346 82.612% 732 22.6 40.21C 0.982
12.030V 5.01V 3.362V 5.118V 122.679 47.23C 114.83V
CL3 0.114A 0A 19.787A 0A 67.374 78.926% 0 <6.0 49.09C 0.973
12.027V 5.051V 3.335V 5.114V 85.351 40.07C 114.85V
CL4 62.543A 0A 0A 0A 749.493 87.985% 1540 41.3 45.34C 0.997
11.983V 5V 3.305V 5.064V 851.886 56.31C 114.61V

Load regulation is within 1% at 12V but loose on the minor rails.

Ripple Suppression

Test 12V 5V 3.3V 5VSB Pass/Fail
10% Load 17.9 mV 8.2 mV 10.8 mV 5.6 mV Pass
20% Load 16.9 mV 7.6 mV 11.4 mV 5.5 mV Pass
30% Load 18.7 mV 7.4 mV 11.9 mV 5.9 mV Pass
40% Load 20.9 mV 8.3 mV 12.1 mV 6.2 mV Pass
50% Load 21.6 mV 9.2 mV 11.7 mV 6.6 mV Pass
60% Load 20.6 mV 10.9 mV 12.9 mV 6.9 mV Pass
70% Load 23.3 mV 12.3 mV 11.9 mV 8.0 mV Pass
80% Load 25.0 mV 12.0 mV 14.6 mV 9.5 mV Pass
90% Load 29.4 mV 13.0 mV 14.3 mV 9.7 mV Pass
100% Load 37.9 mV 15.1 mV 17.4 mV 12.0 mV Pass
110% Load 35.1 mV 15.1 mV 18.0 mV 13.5 mV Pass
Crossload 1 19.0 mV 10.2 mV 13.4 mV 15.8 mV Pass
Crossload 2 22.9 mV 15.1 mV 13.0 mV 17.2 mV Pass
Crossload 3 20.4 mV 8.2 mV 12.7 mV 13.8 mV Pass
Crossload 4 36.4 mV 14.3 mV 16.2 mV 13.3 mV Pass

Ripple suppression is good on the minor rails but not competitive at 12V.

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