Cooler Master GX III 650W 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% 3.608A 1.981A 1.962A 0.982A 64.994 88.893% 0 <6.0 44.31C 0.979
12.027V 5.048V 3.364V 5.091V 73.119 40.02C 114.85V
20% 8.236A 2.978A 2.953A 1.183A 129.916 91.579% 0 <6.0 45.27C 0.988
12.022V 5.038V 3.352V 5.073V 141.882 40.71C 114.83V
30% 13.220A 3.481A 3.456A 1.385A 194.917 91.605% 1047 27.5 41.17C 0.992
12.018V 5.028V 3.342V 5.055V 212.773 46.21C 114.81V
40% 18.213A 3.986A 3.962A 1.588A 259.996 91.582% 1052 27.5 41.62C 0.995
12.012V 5.018V 3.332V 5.036V 283.913 47.13C 114.78V
50% 22.860A 4.994A 4.971A 1.794A 324.989 91.01% 1219 31.3 42.30C 0.996
12.007V 5.007V 3.32V 5.017V 357.086 48.33C 114.77V
60% 27.456A 6.006A 5.987A 2A 389.299 90.326% 1421 35.5 42.67C 0.997
12.001V 4.995V 3.307V 4.998V 430.997 49.21C 114.74V
70% 32.140A 7.025A 7.012A 2.209A 454.62 89.583% 1638 38.7 43.42C 0.998
11.995V 4.983V 3.295V 4.979V 507.454 50.45C 114.71V
80% 36.830A 8.002A 8.044A 2.316A 519.228 88.783% 1861 41.7 43.88C 0.998
11.989V 4.971V 3.282V 4.965V 584.851 52.01C 114.69V
90% 41.919A 8.566A 8.561A 2.424A 584.833 87.943% 2103 44.9 44.17C 0.997
11.983V 4.961V 3.27V 4.951V 664.988 53.18C 114.66V
100% 46.751A 9.089A 9.112A 3.056A 649.674 87.02% 2365 48.2 45.36C 0.997
11.978V 4.951V 3.259V 4.909V 746.608 55.37C 114.63V
110% 51.455A 10.124A 10.258A 3.062A 714.292 86.001% 2682 51.4 46.71C 0.996
11.972V 4.938V 3.246V 4.9V 830.574 57.62C 114.61V
CL1 0.115A 14.467A 14.432A 0A 121.285 83.598% 1170 30.0 40.23C 0.988
12.005V 4.991V 3.305V 5.124V 145.086 45.71C 114.83V
CL2 0.115A 20.018A 0A 0A 101.355 82.062% 1036 27.0 40.02C 0.987
12.017V 4.994V 3.352V 5.134V 123.545 47.07C 114.83V
CL3 0.115A 0A 19.952A 0A 67.379 77.582% 1036 27.0 40.27C 0.983
12.014V 5.036V 3.308V 5.13V 86.854 49.36C 114.85V
CL4 54.142A 0A 0A 0A 649.487 88.215% 2167 48.8 45.79C 0.997
11.996V 4.993V 3.302V 5.087V 736.295 56.77C 114.64V

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 40.9 mV 18.1 mV 11.9 mV 6.9 mV Pass
20% Load 21.1 mV 8.9 mV 10.3 mV 5.6 mV Pass
30% Load 25.5 mV 9.9 mV 10.8 mV 5.8 mV Pass
40% Load 25.4 mV 9.6 mV 12.5 mV 6.4 mV Pass
50% Load 29.9 mV 10.2 mV 12.9 mV 6.8 mV Pass
60% Load 33.4 mV 11.2 mV 12.6 mV 8.4 mV Pass
70% Load 37.7 mV 11.9 mV 13.0 mV 8.8 mV Pass
80% Load 40.4 mV 11.7 mV 15.7 mV 9.3 mV Pass
90% Load 49.9 mV 13.1 mV 15.3 mV 11.5 mV Pass
100% Load 48.5 mV 14.9 mV 17.2 mV 12.4 mV Pass
110% Load 50.9 mV 15.9 mV 17.1 mV 13.2 mV Pass
Crossload 1 30.5 mV 11.8 mV 14.4 mV 15.1 mV Pass
Crossload 2 27.7 mV 16.3 mV 12.0 mV 16.3 mV Pass
Crossload 3 25.9 mV 9.0 mV 13.9 mV 13.8 mV Pass
Crossload 4 35.2 mV 13.3 mV 14.5 mV 14.9 mV Pass

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

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