MSI PRO A1000PL PCIE5 1000W 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% 6.494A 1.981A 1.983A 0.996A 100.009 90.007% 1119 33.4 40.17°C 0.954
12.074V 5.048V 3.329V 5.023V 111.064 41.91°C 114.84V
20% 14.010A 2.973A 2.976A 1.197A 199.967 92.364% 1157 34.3 40.95°C 0.974
12.067V 5.046V 3.327V 5.012V 216.571 40.94°C 114.81V
30% 21.893A 3.469A 3.474A 1.4A 300.025 92.579% 1296 36.9 41.23°C 0.985
12.058V 5.045V 3.325V 5.002V 324.078 43.98°C 114.81V
40% 29.750A 3.965A 3.972A 1.603A 399.628 92.46% 1392 38.8 41.54°C 0.993
12.048V 5.044V 3.324V 4.991V 432.17 43.75°C 114.74V
50% 37.281A 4.959A 4.968A 1.807A 499.349 92.115% 1422 39.4 42.22°C 0.994
12.039V 5.042V 3.322V 4.98V 542.136 43.31°C 114.71V
60% 44.890A 5.954A 5.966A 2A 599.816 91.59% 1481 40.3 42.79°C 0.995
12.031V 5.04V 3.32V 4.97V 654.897 43.38°C 114.67V
70% 52.451A 6.95A 6.965A 2.219A 699.61 90.881% 1676 42.8 43.48°C 0.996
12.021V 5.037V 3.317V 4.959V 769.87 46.3°C 114.63V
80% 60.102A 7.942A 7.963A 2.324A 799.6 90.131% 1883 45.6 43.83°C 0.996
12.008V 5.036V 3.315V 4.949V 887.136 50.43°C 114.59V
90% 68.099A 8.441A 8.449A 2.43A 899.372 89.299% 2062 47.5 44.52°C 0.996
11.996V 5.035V 3.314V 4.94V 1007.233 49.73°C 114.55V
100% 76.203A 8.94A 8.967A 2.535A 1000.104 88.348% 2093 47.9 45.19°C 0.996
11.980V 5.033V 3.312V 4.932V 1132.023 53.67°C 114.51V
110% 83.942A 9.937A 10.06A 2.54A 1099.919 87.291% 2090 47.8 46.2°C 0.996
11.962V 5.032V 3.31V 4.923V 1260.071 56.15°C 114.48V
CL1 0.118A 11.944A 11.96A 0A 101.313 86.094% 1451 40 40.8°C 0.956
12.045V 5.04V 3.319V 5.025V 117.76 45.13°C 114.83V
CL2 0.117A 19.808A 0A 0A 101.366 85.619% 1324 37.2 40.76°C 0.956
12.060V 5.046V 3.319V 5.033V 118.374 41.77°C 114.84V
CL3 0.116A 0A 19.843A 0A 67.388 81.052% 1261 36.5 40.16°C 0.945
12.068V 5.04V 3.326V 5.031V 83.14 41.85°C 114.85V
CL4 83.339A 0A 0A 0.001A 999.967 89.243% 2099 48.1 45.23°C 0.996
11.999V 5.044V 3.323V 5.003V 1120.532 50.17°C 114.52V

Load regulation is within 1% on all rails. I would ike to see a tighter load regulation at 12V.

Test 12V 5V 3.3V 5VSB DC/AC (Watts) Efficiency Fan Speed (RPM) PSU Noise (dB[A]) Temps (In/Out) PF/AC Volts
20W 1.230A 0.495A 0.495A 0.198A 20.008 77.734% 1112 33.3 36.83°C 0.685
12.084V 5.049V 3.332V 5.047V 25.755 38.49°C 114.87V
40W 2.706A 0.693A 0.694A 0.297A 40.006 84.957% 1116 33.3 37.07°C 0.924
12.081V 5.049V 3.331V 5.044V 47.262 39.01°C 114.86V
60W 4.184A 0.891A 0.892A 0.397A 60.006 88.009% 1119 33.4 38.31°C 0.937
12.079V 5.049V 3.331V 5.04V 68.26 39.98°C 114.86V
80W 5.658A 1.089A 1.09A 0.497A 79.955 89.814% 1120 33.4 39.18°C 0.947
12.076V 5.049V 3.33V 5.036V 89.122 40.75°C 114.85V

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 29.9 mV 19.7 mV 17.6 mV 12.1 mV Pass
20% Load 23.6 mV 19.7 mV 18.2 mV 12.4 mV Pass
30% Load 24.3 mV 21.4 mV 17.8 mV 12.0 mV Pass
40% Load 25.0 mV 20.8 mV 18.6 mV 13.2 mV Pass
50% Load 27.1 mV 22.6 mV 18.6 mV 14.3 mV Pass
60% Load 27.9 mV 23.6 mV 18.8 mV 14.8 mV Pass
70% Load 29.8 mV 24.1 mV 20.1 mV 18.1 mV Pass
80% Load 30.9 mV 25.3 mV 20.1 mV 17.9 mV Pass
90% Load 38.5 mV 24.8 mV 19.9 mV 18.8 mV Pass
100% Load 37.9 mV 24.3 mV 20.4 mV 17.9 mV Pass
110% Load 36.0 mV 26.5 mV 19.7 mV 19.2 mV Pass
Crossload 1 29.4 mV 19.3 mV 19.9 mV 14.6 mV Pass
Crossload 2 31.9 mV 26.4 mV 17.2 mV 13.7 mV Pass
Crossload 3 28.2 mV 19.6 mV 20.0 mV 13.2 mV Pass
Crossload 4 38.5 mV 24.7 mV 18.6 mV 17.3 mV Pass

Ripple suppression is not competitive, especially at 12V, which is the most important rail. That said, you cannot say it is high, since it remains close to 40 mV even in the worst-case scenario.

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