Cooler Master GX III 850W 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% 5.276A 1.976A 1.963A 0.983A 85.006 90.128% 0 <6.0 43.85C 0.978
12.019V 5.063V 3.363V 5.086V 94.361 39.70C 114.85V
20% 11.576A 2.97A 2.954A 1.184A 169.952 92.352% 0 <6.0 45.28C 0.992
12.012V 5.052V 3.351V 5.068V 184.009 40.74C 114.82V
30% 18.234A 3.471A 3.457A 1.386A 254.96 92.593% 0 <6.0 46.05C 0.995
12.005V 5.043V 3.342V 5.051V 275.365 41.03C 114.79V
40% 24.907A 3.974A 3.962A 1.59A 340.053 92.227% 0 <6.0 47.23C 0.996
11.999V 5.034V 3.332V 5.033V 368.458 41.54C 114.69V
50% 31.225A 4.98A 4.972A 1.795A 424.933 91.354% 827 26.2 42.10C 0.997
11.991V 5.022V 3.319V 5.015V 465.143 48.55C 114.73V
60% 37.526A 5.991A 5.989A 2A 509.448 90.527% 916 29.0 42.90C 0.997
11.982V 5.009V 3.306V 4.996V 562.709 49.48C 114.7V
70% 43.900A 7.007A 7.015A 2.21A 594.749 89.558% 1088 33.2 43.01C 0.997
11.974V 4.996V 3.293V 4.977V 664.071 50.08C 114.66V
80% 50.287A 8.002A 8.048A 2.318A 679.463 88.5% 1325 37.8 43.60C 0.998
11.965V 4.984V 3.28V 4.962V 767.758 51.68C 114.63V
90% 57.076A 8.546A 8.566A 2.425A 764.977 87.394% 1593 42.1 44.42C 0.998
11.957V 4.973V 3.269V 4.949V 875.321 53.49C 114.59V
100% 63.610A 9.069A 9.119A 3.056A 849.803 86.082% 1842 45.2 45.28C 0.998
11.949V 4.962V 3.257V 4.909V 987.219 55.32C 114.56V
110% 70.018A 10.103A 10.266A 3.062A 934.38 84.663% 1843 45.2 46.71C 0.998
11.942V 4.949V 3.243V 4.9V 1103.61 57.62C 114.51V
CL1 0.117A 14.399A 14.361A 0A 121.302 83.984% 0 <6.0 45.48C 0.988
12.006V 5.014V 3.321V 5.12V 144.454 40.01C 114.83V
CL2 0.115A 19.918A 0A 0A 101.377 82.452% 0 <6.0 48.14C 0.984
12.018V 5.02V 3.355V 5.129V 122.967 41.08C 114.83V
CL3 0.115A 0A 19.835A 0A 67.385 78.194% 0 <6.0 49.27C 0.976
12.016V 5.058V 3.327V 5.126V 86.224 40.18C 114.84V
CL4 71.010A 0A 0A 0A 849.58 86.972% 1827 45.1 45.10C 0.998
11.965V 5.002V 3.291V 5.071V 976.858 56.05C 114.56V

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 20.4 mV 6.7 mV 8.8 mV 5.1 mV Pass
20% Load 16.7 mV 5.7 mV 7.8 mV 5.1 mV Pass
30% Load 20.1 mV 6.1 mV 9.2 mV 4.9 mV Pass
40% Load 19.1 mV 6.1 mV 13.4 mV 5.2 mV Pass
50% Load 20.8 mV 6.6 mV 15.8 mV 5.7 mV Pass
60% Load 23.4 mV 7.0 mV 13.6 mV 6.7 mV Pass
70% Load 25.2 mV 7.6 mV 9.3 mV 7.4 mV Pass
80% Load 27.7 mV 8.6 mV 11.6 mV 8.3 mV Pass
90% Load 37.0 mV 10.5 mV 11.5 mV 9.1 mV Pass
100% Load 42.7 mV 12.0 mV 14.2 mV 16.2 mV Pass
110% Load 47.4 mV 13.0 mV 15.3 mV 17.2 mV Pass
Crossload 1 23.6 mV 9.5 mV 12.7 mV 18.8 mV Pass
Crossload 2 21.2 mV 12.7 mV 8.8 mV 16.8 mV Pass
Crossload 3 22.4 mV 6.8 mV 12.7 mV 13.9 mV Pass
Crossload 4 32.7 mV 9.7 mV 12.0 mV 12.1 mV Pass

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

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