Chieftec VEGA M 850W 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% 5.271A 1.995A 1.993A 0.985A 84.999 84.742% 621 18.5 40.3°C 0.972
12.028V 5.013V 3.311V 5.077V 100.282 42.8°C 115.1V
20% 11.571A 2.994A 2.992A 1.185A 169.921 89.463% 623 18.6 40.89°C 0.986
12.015V 5.01V 3.309V 5.063V 189.949 43.18°C 115.07V
30% 18.262A 3.495A 3.493A 1.386A 254.921 91.198% 623 18.6 41.17°C 0.996
11.985V 5.008V 3.307V 5.049V 279.534 44.84°C 115.03V
40% 24.963A 3.996A 3.994A 1.589A 340.003 91.183% 623 18.6 41.73°C 0.996
11.970V 5.006V 3.305V 5.034V 372.856 45.52°C 115V
50% 31.302A 4.999A 4.996A 1.793A 424.762 90.874% 631 18.5 42.49°C 0.997
11.957V 5.002V 3.303V 5.019V 467.449 47.55°C 114.97V
60% 37.642A 6.003A 5.999A 1.999A 509.3 90.393% 818 27.3 42.64°C 0.997
11.941V 4.998V 3.301V 5.004V 563.394 47.63°C 114.93V
70% 44.063A 7.009A 7.003A 2.205A 594.618 89.726% 1036 34.3 43.07°C 0.998
11.927V 4.994V 3.299V 4.988V 662.733 49.15°C 114.9V
80% 50.499A 8.015A 8.007A 2.311A 679.441 89.036% 1211 38.7 43.64°C 0.998
11.912V 4.99V 3.297V 4.975V 763.161 50.37°C 114.86V
90% 57.349A 8.52A 8.498A 2.418A 764.869 88.311% 1360 41.7 44.82°C 0.998
11.899V 4.988V 3.295V 4.962V 866.165 51.82°C 114.83V
100% 63.951A 9.026A 9.02A 3.039A 849.676 87.438% 1452 44 45.32°C 0.998
11.885V 4.985V 3.292V 4.936V 971.79 53.05°C 114.79V
110% 70.427A 10.037A 10.12A 3.046A 934.257 86.511% 1455 44.2 46.53°C 0.998
11.871V 4.981V 3.29V 4.924V 1079.937 55.6°C 114.76V
CL1 0.115A 12.068A 11.986A 0A 101.284 81.449% 680 21.1 41.35°C 0.977
12.016V 4.988V 3.312V 5.083V 124.361 46.63°C 115.08V
CL2 0.115A 20.14A 0A 0A 101.355 79.977% 631 18.5 41.33°C 0.978
12.024V 4.964V 3.312V 5.091V 126.8 46.58°C 115.08V
CL3 0.115A 0A 19.948A 0A 67.375 74.569% 626 18.5 41.06°C 0.969
12.022V 5.019V 3.308V 5.086V 90.336 45.27°C 115.09V
CL4 71.424A 0A 0A 0A 849.434 88.125% 1412 42.8 45.58°C 0.998
11.894V 5.011V 3.291V 5.035V 963.916 52.4°C 114.79V

Load regulation is loose at 12V, the most important rail. It is tight enough on the minor 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 0.498A 0.498A 0.196A 19.997 75.913% 620 18.4 36.88°C 0.831
12.049V 5.017V 3.311V 5.108V 26.379 37.43°C 115.11V
40W 2.717A 0.698A 0.698A 0.294A 39.996 68.136% 618 18 37.5°C 0.944
12.030V 5.016V 3.31V 5.103V 58.692 39.74°C 115.1V
60W 4.200A 0.897A 0.897A 0.392A 59.995 81.159% 621 18.5 38.74°C 0.957
12.029V 5.016V 3.311V 5.098V 73.923 40.79°C 115.1V
80W 5.678A 1.097A 1.096A 0.491A 79.931 84.434% 620 18.4 39.5°C 0.97
12.029V 5.016V 3.311V 5.093V 94.67 41.32°C 115.09V

A glance at the light loads table is always useful, as the PSU will typically operate 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 of the AC-to-DC conversion process. Lower ripple is highly preferable because it ensures a cleaner, more stable DC output, thereby reducing noise and potential interference in sensitive electronics, which improves performance and extends the lifespan of components. High ripple can cause instability, overheating, or damage to connected devices.

Test 12V 5V 3.3V 5VSB Pass/Fail
10% Load 9.9 mV 9.8 mV 10.5 mV 6.6 mV Pass
20% Load 9.9 mV 9.8 mV 10.2 mV 6.7 mV Pass
30% Load 21.3 mV 10.0 mV 10.7 mV 7.5 mV Pass
40% Load 18.0 mV 10.2 mV 10.8 mV 8.0 mV Pass
50% Load 17.1 mV 9.9 mV 11.1 mV 8.2 mV Pass
60% Load 16.4 mV 10.1 mV 11.4 mV 8.8 mV Pass
70% Load 16.1 mV 10.3 mV 11.6 mV 9.5 mV Pass
80% Load 17.9 mV 13.6 mV 14.9 mV 10.5 mV Pass
90% Load 22.9 mV 21.3 mV 22.9 mV 13.8 mV Pass
100% Load 20.6 mV 18.6 mV 20.1 mV 11.9 mV Pass
110% Load 20.0 mV 18.7 mV 19.2 mV 12.4 mV Pass
Crossload 1 25.1 mV 9.9 mV 11.2 mV 10.4 mV Pass
Crossload 2 28.1 mV 11.8 mV 10.9 mV 10.7 mV Pass
Crossload 3 12.6 mV 14.3 mV 13.5 mV 9.9 mV Pass
Crossload 4 21.5 mV 19.8 mV 21.4 mV 15.4 mV Pass

Ripple suppression is good overall.

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