Corsair RM850x Shift ATX v3.1 PSU Review

Load Regulation

It measures the stability of the output voltage when the load connected to the power supply varies.

Test 12V 5V 3.3V 5VSB DC/AC (Watts) Efficiency Fan Speed (RPM) PSU Noise (dB[A]) Temps (In/Out) PF/AC Volts
10% 5.260A 1.998A 1.989A 0.993A 85.008 86.216% 0 <6.0 49.49°C 0.971
12.053V 5.005V 3.319V 5.035V 98.567 40.29°C 114.93V
20% 11.545A 2.999A 2.984A 1.193A 169.979 91.897% 0 <6.0 48.81°C 0.985
12.046V 5.004V 3.318V 5.029V 184.979 40.89°C 114.92V
30% 18.185A 3.499A 3.483A 1.394A 254.993 92.572% 0 <6.0 52.19°C 0.99
12.039V 5.002V 3.317V 5.023V 275.426 41.24°C 114.91V
40% 24.838A 4A 3.982A 1.595A 340.088 92.58% 0 <6.0 52.41°C 0.994
12.033V 5.001V 3.316V 5.016V 367.303 41.97°C 114.88V
50% 31.149A 5.002A 4.979A 1.797A 425.113 92.055% 0 <6.0 52.81°C 0.996
12.026V 4.999V 3.314V 5.01V 461.787 42.25°C 114.86V
60% 37.426A 6.005A 5.977A 1.999A 509.639 91.473% 762 22.7 42.68°C 0.998
12.019V 4.997V 3.313V 5.003V 557.128 79.85°C 114.84V
70% 43.777A 7.009A 6.978A 2.202A 594.987 90.863% 450 <6.0 43.47°C 0.998
12.012V 4.995V 3.311V 4.997V 654.823 77.71°C 114.82V
80% 50.137A 8.012A 7.977A 2.305A 679.833 90.057% 589 13.4 43.63°C 0.998
12.006V 4.993V 3.31V 4.991V 754.84 76.86°C 114.8V
90% 56.905A 8.517A 8.464A 2.408A 765.297 89.324% 828 25.5 44.39°C 0.999
11.999V 4.991V 3.308V 4.985V 856.776 74.81°C 114.77V
100% 63.412A 9.021A 8.983A 3.017A 850.158 88.493% 1064 32.8 45.5°C 0.999
11.992V 4.989V 3.307V 4.973V 960.678 71.2°C 114.73V
110% 69.799A 10.028A 10.077A 3.02A 934.796 87.561% 1334 39 46.34°C 0.999
11.985V 4.987V 3.305V 4.968V 1067.598 69.46°C 114.7V
CL1 0.118A 14.47A 14.402A 0A 121.327 81.583% 515 8 41.85°C 0.981
12.041V 4.99V 3.312V 5.039V 148.313 54.85°C 114.63V
CL2 0.117A 20.045A 0A 0A 101.412 80.064% 1196 36.2 40.45°C 0.977
12.049V 4.989V 3.321V 5.043V 126.677 47.33°C 114.89V
CL3 0.116A 0A 19.954A 0A 67.409 75.777% 792 24 40.33°C 0.968
12.050V 5.004V 3.308V 5.041V 88.99 47.01°C 114.9V
CL4 70.846A 0A 0A 0A 849.992 89.146% 986 30.8 45.93°C 0.999
11.998V 5.001V 3.313V 5.009V 953.587 64.82°C 114.7V

Load regulation is within 1% on all primary rails.

Test 12V 5V 3.3V 5VSB DC/AC (Watts) Efficiency Fan Speed (RPM) PSU Noise (dB[A]) Temps (In/Out) PF/AC Volts
20W 1.232A 0.499A 0.497A 0.198A 20.009 74.821% 0 <6.0 43.26°C 0.87
12.060V 5.008V 3.321V 5.047V 26.751 36.58°C 114.95V
40W 2.712A 0.699A 0.696A 0.297A 40.006 81.157% 0 <6.0 44.38°C 0.94
12.058V 5.008V 3.321V 5.045V 49.309 37.13°C 114.95V
60W 4.191A 0.899A 0.894A 0.397A 60.005 84.558% 0 <6.0 46.03°C 0.958
12.057V 5.008V 3.321V 5.043V 70.955 38.31°C 114.94V
80W 5.669A 1.099A 1.093A 0.496A 79.971 86.058% 0 <6.0 47.38°C 0.968
12.054V 5.007V 3.32V 5.041V 92.937 39.17°C 114.94V

A glance at the light-load table is always useful, as the PSU typically operates at light loads.

Ripple Suppression

Ripple in power supplies refers to the small, unwanted AC voltage fluctuations superimposed on the DC output. It occurs due to imperfect filtering during the AC-to-DC conversion. Lower ripple is highly preferable because it ensures a cleaner, more stable DC output, reducing noise and potential interference in sensitive electronics, improving performance, and extending component lifespan. High ripple can cause instability, overheating, or damage to connected devices.

Test 12V 5V 3.3V 5VSB Pass/Fail
10% Load 11.4 mV 8.9 mV 4.7 mV 8.4 mV Pass
20% Load 10.3 mV 8.8 mV 4.7 mV 7.8 mV Pass
30% Load 10.2 mV 8.8 mV 4.9 mV 8.9 mV Pass
40% Load 10.4 mV 8.9 mV 7.1 mV 8.8 mV Pass
50% Load 10.8 mV 9.2 mV 7.1 mV 8.6 mV Pass
60% Load 12.7 mV 9.6 mV 6.2 mV 9.3 mV Pass
70% Load 12.6 mV 10.3 mV 6.0 mV 10.3 mV Pass
80% Load 13.1 mV 10.2 mV 10.3 mV 9.8 mV Pass
90% Load 13.5 mV 10.9 mV 9.1 mV 10.0 mV Pass
100% Load 21.0 mV 11.0 mV 10.2 mV 17.4 mV Pass
110% Load 23.9 mV 12.0 mV 10.1 mV 17.3 mV Pass
Crossload 1 18.5 mV 12.0 mV 9.9 mV 8.6 mV Pass
Crossload 2 11.8 mV 11.3 mV 5.5 mV 8.9 mV Pass
Crossload 3 13.9 mV 11.9 mV 10.0 mV 8.7 mV Pass
Crossload 4 21.9 mV 9.6 mV 6.6 mV 8.8 mV Pass

Ripple suppression is good overall.

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