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The GF3 850 achieves good performance, but the Corsair RM850x and the EVGA 850 G7 are far ahead.
The graph below depicts the cooling fan's average noise over the PSU's operating range, with an ambient temperature between 30 to 32 degrees Celsius (86 to 89.6 degrees Fahrenheit).
Under normal operating temperatures, the average noise output is below 30 dBA. With lower noise at high loads, it could be close to 25 dBA.
The following graph shows the PSU's average efficiency throughout its operating range with an ambient temperature close to 30 degrees Celsius.
Average efficiency should be higher, above 88%, at least.
Power Factor Rating
The following graphs show the PSU's average power factor reading throughout its operating range with an ambient temperature close to 30 degrees Celsius and 115V/230V voltage input.
The APFC converter registers good performance.
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Aris Mpitziopoulos is a Contributing Editor at Tom's Hardware US, covering PSUs.