be quiet! Power Zone 2 850W 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% 5.182A 1.964A 1.971A 1.002A 85.005 88.678% 0 <6.0 48.93°C 0.957
12.237V 5.092V 3.348V 4.993V 95.858 40.05°C 114.88V
20% 11.370A 2.949A 2.962A 1.205A 169.947 91.755% 0 <6.0 49.28°C 0.972
12.229V 5.087V 3.343V 4.981V 185.218 40.53°C 114.86V
30% 17.913A 3.443A 3.46A 1.409A 254.957 92.49% 0 <6.0 52.15°C 0.978
12.220V 5.083V 3.339V 4.969V 275.659 41.46°C 114.84V
40% 24.474A 3.938A 3.959A 1.614A 340.05 92.515% 0 <6.0 52.95°C 0.983
12.211V 5.078V 3.334V 4.958V 367.564 41.74°C 114.8V
50% 30.684A 4.928A 4.957A 1.82A 424.875 92.142% 0 <6.0 55.84°C 0.987
12.201V 5.073V 3.329V 4.946V 461.112 42.33°C 114.78V
60% 36.877A 5.921A 5.959A 2A 509.273 91.287% 0 <6.0 57.43°C 0.99
12.191V 5.068V 3.323V 4.936V 557.884 42.66°C 114.74V
70% 43.138A 6.913A 6.962A 2.234A 594.704 90.676% 1035 26.7 43.05°C 0.992
12.184V 5.063V 3.319V 4.923V 655.857 47.84°C 114.71V
80% 49.412A 7.906A 7.967A 2.341A 679.526 90.183% 1180 30.6 43.73°C 0.993
12.176V 5.058V 3.314V 4.913V 753.5 48.49°C 114.67V
90% 56.091A 8.407A 8.461A 2.447A 764.954 89.617% 1344 33.9 44.72°C 0.993
12.167V 5.054V 3.309V 4.904V 853.588 48.71°C 114.65V
100% 62.516A 8.91A 8.988A 3.073A 849.763 88.994% 1497 36.9 45.1°C 0.994
12.158V 5.05V 3.304V 4.881V 954.861 49.79°C 114.61V
110% 68.820A 9.911A 10.085A 3.078A 934.33 88.29% 1643 39.3 46.53°C 0.994
12.149V 5.044V 3.302V 4.874V 1058.255 50.99°C 114.57V
CL1 0.115A 14.255A 14.367A 0A 121.294 85.775% 0 <6.0 46.72°C 0.97
12.227V 5.064V 3.32V 5.007V 141.41 40.17°C 114.87V
CL2 0.113A 19.728A 0A 0A 101.343 84.309% 0 <6.0 48.17°C 0.967
12.233V 5.067V 3.334V 5.014V 120.208 40.89°C 114.87V
CL3 0.113A 0A 19.876A 0A 67.397 78.999% 0 <6.0 47.36°C 0.955
12.232V 5.072V 3.321V 5.014V 85.312 40.68°C 114.89V
CL4 69.842A 0A 0A 0A 849.521 89.535% 1509 37.2 45.09°C 0.994
12.164V 5.067V 3.326V 4.971V 948.817 49.27°C 114.61V

Load regulation is within 1% at 12V and 5V, but loose at 3.3V.

Ripple Suppression

Test 12V 5V 3.3V 5VSB Pass/Fail
10% Load 19.0 mV 12.5 mV 12.8 mV 11.9 mV Pass
20% Load 25.4 mV 13.4 mV 13.3 mV 13.2 mV Pass
30% Load 27.7 mV 12.4 mV 12.6 mV 11.7 mV Pass
40% Load 29.5 mV 12.8 mV 13.2 mV 11.9 mV Pass
50% Load 30.1 mV 13.8 mV 15.1 mV 13.0 mV Pass
60% Load 32.4 mV 12.8 mV 14.2 mV 12.1 mV Pass
70% Load 32.1 mV 12.9 mV 14.9 mV 13.1 mV Pass
80% Load 34.8 mV 13.7 mV 15.9 mV 14.0 mV Pass
90% Load 33.9 mV 14.4 mV 15.2 mV 13.5 mV Pass
100% Load 49.8 mV 14.7 mV 17.7 mV 15.7 mV Pass
110% Load 52.4 mV 17.2 mV 19.8 mV 17.8 mV Pass
Crossload 1 36.4 mV 15.9 mV 20.6 mV 14.4 mV Pass
Crossload 2 21.8 mV 16.6 mV 16.1 mV 13.4 mV Pass
Crossload 3 20.5 mV 12.7 mV 19.8 mV 13.1 mV Pass
Crossload 4 49.3 mV 13.8 mV 14.1 mV 15.1 mV Pass

Ripple suppression is increased at 100% and 110% load levels at 12V. This was the case in the 1000W unit, too. On the other hand, ripple suppression is good on the minor rails.

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