Corsair RM850x ATX v3.1 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% 5.256A 1.974A 2.005A 1.009A 85.005 85.379% 0 <6.0 44.28C 0.977
12.062V 5.065V 3.292V 4.958V 99.563 40.02C 114.87V
20% 11.533A 2.962A 3.009A 1.212A 169.949 89.467% 0 <6.0 45.11C 0.989
12.056V 5.064V 3.29V 4.952V 189.957 40.58C 114.85V
30% 18.192A 3.456A 3.512A 1.415A 254.957 91.145% 0 <6.0 46.07C 0.99
12.032V 5.064V 3.289V 4.946V 279.727 41.02C 114.82V
40% 24.850A 3.95A 4.015A 1.62A 340.056 91.282% 0 <6.0 47.06C 0.99
12.026V 5.064V 3.288V 4.94V 372.527 41.53C 114.79V
50% 31.148A 4.938A 5.022A 1.824A 424.894 90.951% 0 <6.0 48.08C 0.992
12.019V 5.063V 3.286V 4.934V 467.168 42.07C 114.76V
60% 37.431A 5.929A 6.031A 2A 509.306 90.465% 448 6.6 42.67C 0.993
12.012V 5.061V 3.283V 4.933V 562.989 49.19C 114.72V
70% 43.784A 6.919A 7.041A 2.232A 594.761 89.864% 542 11.0 43.24C 0.994
12.005V 5.059V 3.282V 4.929V 661.851 50.27C 114.71V
80% 50.146A 7.908A 8.05A 2.335A 679.553 89.167% 702 19.9 43.82C 0.995
11.998V 5.058V 3.28V 4.925V 762.119 51.87C 114.66V
90% 56.912A 8.403A 8.541A 2.439A 764.981 88.397% 852 26.3 44.45C 0.995
11.992V 5.057V 3.278V 4.921V 865.395 53.54C 114.63V
100% 63.416A 8.899A 9.064A 3.05A 849.805 87.514% 986 30.8 45.67C 0.996
11.986V 5.056V 3.277V 4.919V 971.054 55.72C 114.59V
110% 69.791A 9.89A 10.168A 3.053A 934.384 86.549% 1115 34.8 46.67C 0.996
11.980V 5.055V 3.275V 4.913V 1079.597 57.58C 114.56V
CL1 0.116A 17.855A 18.225A 0A 151.301 82.555% 450 6.6 43.32C 0.989
12.055V 5.057V 3.271V 4.945V 183.271 48.79C 114.84V
CL2 0.115A 19.73A 0A 0A 101.351 82.44% 449 6.6 41.21C 0.981
12.063V 5.066V 3.287V 4.953V 122.94 48.22C 114.87V
CL3 0.115A 0A 20.139A 0A 67.4 76.135% 448 6.6 39.94C 0.972
12.062V 5.068V 3.278V 4.954V 88.525 49.03C 114.88V
CL4 70.858A 0A 0A 0A 849.55 88.4% 1011 31.7 44.48C 0.995
11.989V 5.065V 3.289V 4.917V 961.033 55.45C 114.6V

Load regulation is tight on all rails.

Ripple Suppression

Test 12V 5V 3.3V 5VSB Pass/Fail
10% Load 11.1 mV 10.5 mV 9.3 mV 10.2 mV Pass
20% Load 19.3 mV 11.5 mV 11.4 mV 11.3 mV Pass
30% Load 16.0 mV 11.8 mV 11.2 mV 11.5 mV Pass
40% Load 13.9 mV 10.8 mV 11.0 mV 11.6 mV Pass
50% Load 15.4 mV 11.8 mV 12.3 mV 12.2 mV Pass
60% Load 16.4 mV 12.1 mV 11.6 mV 12.0 mV Pass
70% Load 15.4 mV 10.7 mV 11.8 mV 11.3 mV Pass
80% Load 17.8 mV 13.6 mV 13.8 mV 13.3 mV Pass
90% Load 18.6 mV 14.9 mV 14.0 mV 13.0 mV Pass
100% Load 24.2 mV 15.0 mV 15.8 mV 16.8 mV Pass
110% Load 25.4 mV 16.1 mV 16.4 mV 17.4 mV Pass
Crossload 1 19.7 mV 14.6 mV 16.2 mV 14.3 mV Pass
Crossload 2 12.9 mV 15.6 mV 12.0 mV 12.4 mV Pass
Crossload 3 13.4 mV 12.4 mV 15.9 mV 12.0 mV Pass
Crossload 4 24.5 mV 13.6 mV 14.6 mV 13.4 mV Pass

Ripple suppression is good overall.

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One thought on “Corsair RM850x ATX v3.1 PSU Review

  1. Hey Aris, thank you for the review. After my long research and your articles, I finally bought this product (it finally arrived in my country). Is it a problem if the 3.3V channel drops below 3.2? If it is a problem, what causes it?

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