Corsair RM750x 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% 4.466A 2.012A 1.994A 0.99A 75.009 85.703% 0 <6.0 44.26°C 0.96
11.960V 4.971V 3.31V 5.051V 87.517 40.15°C 114.93V
20% 9.963A 3.019A 2.992A 1.19A 149.975 87.996% 0 <6.0 45.37°C 0.979
11.951V 4.97V 3.309V 5.044V 170.434 40.51°C 114.92V
30% 15.819A 3.523A 3.492A 1.39A 224.984 92.058% 0 <6.0 47.58°C 0.985
11.943V 4.969V 3.308V 5.038V 244.379 41.21°C 114.91V
40% 21.688A 4.027A 3.992A 1.59A 300.08 92.113% 0 <6.0 48.81°C 0.989
11.937V 4.968V 3.307V 5.031V 325.791 41.71°C 114.89V
50% 27.182A 5.035A 4.991A 1.792A 374.749 91.647% 0 <6.0 48.74°C 0.992
11.928V 4.966V 3.306V 5.025V 408.929 42.17°C 114.87V
60% 32.701A 6.045A 5.993A 1.993A 449.678 91.014% 414 <6.0 42.73°C 0.995
11.922V 4.965V 3.305V 5.018V 494.076 62.94°C 114.86V
70% 38.230A 7.055A 6.995A 2.196A 524.608 90.411% 451 <6.0 43.33°C 0.996
11.914V 4.963V 3.303V 5.011V 580.264 64.52°C 114.84V
80% 43.831A 8.065A 7.997A 2.298A 599.829 89.479% 695 19.4 43.99°C 0.997
11.908V 4.961V 3.301V 5.005V 670.329 61.86°C 114.83V
90% 49.773A 8.571A 8.485A 2.4A 674.868 88.745% 880 27.6 44.06°C 0.997
11.902V 4.959V 3.3V 5V 760.42 61.36°C 114.81V
100% 55.521A 9.078A 9.004A 3.007A 750.087 87.893% 1078 33.1 45.01°C 0.998
11.894V 4.958V 3.299V 4.989V 853.429 61.97°C 114.79V
110% 61.142A 10.09A 10.1A 3.01A 825.102 86.9% 1296 38.8 46.23°C 0.998
11.887V 4.956V 3.297V 4.985V 949.444 62.03°C 114.77V
CL1 0.118A 14.558A 14.44A 0A 121.312 81.541% 501 7.2 40.75°C 0.974
11.940V 4.96V 3.303V 5.051V 148.393 54.4°C 114.57V
CL2 0.117A 20.159A 0A 0A 101.404 80.142% 1083 33.3 40.66°C 0.972
11.951V 4.961V 3.314V 5.057V 126.521 47.87°C 114.93V
CL3 0.117A 0A 19.998A 0A 67.399 75.852% 730 21.3 40.11°C 0.96
11.956V 4.97V 3.3V 5.056V 88.815 46.9°C 114.93V
CL4 62.985A 0A 0A 0A 749.88 88.772% 982 30.7 45.05°C 0.998
11.906V 4.967V 3.306V 5.03V 844.737 59.63°C 114.77V

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 1.242A 0.503A 0.498A 0.198A 20.008 75.53% 0 <6.0 40.68°C 0.858
11.969V 4.973V 3.312V 5.063V 26.422 36.69°C 114.94V
40W 2.732A 0.704A 0.698A 0.297A 40.006 81.034% 0 <6.0 43.5°C 0.93
11.967V 4.973V 3.312V 5.061V 49.369 37.96°C 114.94V
60W 4.224A 0.905A 0.897A 0.396A 60.004 84.836% 0 <6.0 43.17°C 0.952
11.964V 4.973V 3.311V 5.058V 70.755 38.34°C 114.94V
80W 5.714A 1.107A 1.096A 0.495A 79.971 86.269% 0 <6.0 44.1°C 0.963
11.960V 4.972V 3.311V 5.056V 92.704 39.24°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 11.6 mV 8.8 mV 4.6 mV 8.5 mV Pass
20% Load 18.9 mV 8.7 mV 4.6 mV 9.3 mV Pass
30% Load 10.5 mV 8.5 mV 5.2 mV 9.1 mV Pass
40% Load 11.1 mV 8.7 mV 5.8 mV 10.0 mV Pass
50% Load 11.7 mV 9.4 mV 7.2 mV 9.4 mV Pass
60% Load 11.7 mV 9.9 mV 6.1 mV 9.9 mV Pass
70% Load 12.7 mV 10.0 mV 7.2 mV 10.2 mV Pass
80% Load 12.8 mV 11.4 mV 9.3 mV 10.8 mV Pass
90% Load 13.7 mV 10.6 mV 10.0 mV 10.6 mV Pass
100% Load 20.7 mV 11.7 mV 10.8 mV 14.0 mV Pass
110% Load 22.8 mV 12.2 mV 13.4 mV 15.1 mV Pass
Crossload 1 13.9 mV 13.9 mV 11.3 mV 10.4 mV Pass
Crossload 2 15.9 mV 11.8 mV 5.0 mV 11.1 mV Pass
Crossload 3 11.0 mV 11.5 mV 10.2 mV 9.8 mV Pass
Crossload 4 19.6 mV 9.3 mV 6.2 mV 8.4 mV Pass

Ripple suppression is good overall.

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