Cooler Master GX III 1250W 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% 8.564A 1.989A 1.981A 0.995A 124.954 87.511% 0 <6.0 44.45C 0.985
12.069V 5.028V 3.332V 5.026V 142.762 40.21C 114.83V
20% 18.163A 2.99A 2.981A 1.198A 249.952 91.418% 882 26.2 40.72C 0.996
12.060V 5.018V 3.321V 5.01V 273.409 45.26C 114.79V
30% 28.085A 3.494A 3.488A 1.402A 374.41 91.7% 885 26.3 41.16C 0.998
12.048V 5.009V 3.312V 4.993V 408.372 46.23C 114.75V
40% 38.083A 4A 3.997A 1.608A 499.601 91.358% 888 26.5 41.86C 0.998
12.036V 5.001V 3.303V 4.977V 546.971 47.43C 114.7V
50% 47.767A 5.009A 5.012A 1.815A 624.933 90.806% 1002 29.7 42.34C 0.998
12.025V 4.992V 3.292V 4.96V 688.162 48.42C 114.66V
60% 57.404A 6.023A 6.033A 2A 749.351 90.054% 1198 34.1 42.52C 0.998
12.014V 4.982V 3.282V 4.943V 832.128 49.02C 114.61V
70% 67.132A 7.041A 7.062A 2.234A 874.779 89.053% 1417 38.2 43.58C 0.999
12.002V 4.972V 3.272V 4.924V 982.318 50.66C 114.56V
80% 76.874A 8.002A 8.096A 2.342A 999.294 87.963% 1635 41.3 43.93C 0.998
11.990V 4.962V 3.261V 4.91V 1136.056 51.98C 114.51V
90% 87.021A 8.579A 8.609A 2.45A 1124.974 86.857% 1852 44.5 44.22C 0.998
11.980V 4.954V 3.252V 4.898V 1295.212 53.27C 114.45V
100% 96.929A 9.099A 9.159A 3.083A 1249.749 85.728% 2066 46.9 44.97C 0.998
11.968V 4.945V 3.243V 4.865V 1457.783 54.98C 114.4V
110% 106.727A 10.13A 10.303A 3.09A 1374.355 84.41% 2073 46.9 46.67C 0.998
11.956V 4.935V 3.232V 4.853V 1628.148 57.61C 114.33V
CL1 0.116A 14.45A 14.402A 0A 121.292 80.974% 943 28.2 40.64C 0.988
12.071V 4.996V 3.312V 5.059V 149.831 46.14C 114.83V
CL2 0.114A 19.994A 0A 0A 101.354 78.835% 881 26.2 40.10C 0.979
12.075V 5V 3.33V 5.065V 128.515 47.11C 114.83V
CL3 0.114A 0A 19.889A 0A 67.375 73.925% 880 26.2 40.79C 0.947
12.071V 5.028V 3.318V 5.059V 91.185 49.80C 114.85V
CL4 104.341A 0A 0A 0A 1249.535 86.461% 1952 46.0 45.65C 0.998
11.975V 4.977V 3.263V 4.98V 1445.277 56.59C 114.41V

Load regulation is not tight overall. Only the 12V rail is within 1%.

Ripple Suppression

Test 12V 5V 3.3V 5VSB Pass/Fail
10% Load 14.0 mV 7.9 mV 10.5 mV 5.4 mV Pass
20% Load 13.6 mV 7.8 mV 10.4 mV 5.5 mV Pass
30% Load 17.8 mV 9.3 mV 10.9 mV 6.0 mV Pass
40% Load 22.5 mV 9.0 mV 11.6 mV 6.2 mV Pass
50% Load 27.2 mV 9.0 mV 12.4 mV 7.2 mV Pass
60% Load 28.2 mV 9.0 mV 12.3 mV 7.2 mV Pass
70% Load 29.5 mV 10.1 mV 13.2 mV 8.0 mV Pass
80% Load 33.3 mV 10.2 mV 13.9 mV 8.3 mV Pass
90% Load 35.3 mV 11.5 mV 16.2 mV 9.3 mV Pass
100% Load 38.9 mV 13.9 mV 23.5 mV 11.1 mV Pass
110% Load 40.3 mV 15.3 mV 22.2 mV 12.0 mV Pass
Crossload 1 16.7 mV 11.3 mV 15.0 mV 10.8 mV Pass
Crossload 2 16.8 mV 15.2 mV 12.0 mV 9.4 mV Pass
Crossload 3 57.2 mV 8.5 mV 15.5 mV 10.9 mV Pass
Crossload 4 37.7 mV 10.5 mV 20.6 mV 12.6 mV Pass

Ripple suppression is decent at 12V, good at 5V and 5VSB, and there is room for improvement at 3.3V (at full load).

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