Gigabyte UD850GM Power Supply Review

The Gigabyte UD850GM survived all of our tough tests.

Gigabyte UD850GM
(Image: © Tom's Hardware)

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Performance Rating

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The overall performance is not great, with the P850GM taking the lead. But the latter had reliability issues. 

Noise Rating

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).

(Image credit: Tom's Hardware)

Under normal operating temperatures, the average noise output is high. With higher quality caps on the secondary side, it could go lower. 

Efficiency Rating

The following graph shows the PSU's average efficiency throughout its operating range with an ambient temperature close to 30 degrees Celsius.

(Image credit: Tom's Hardware)

The average efficiency is high, but the P850GM clearly takes the lead. 

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 needs a performance boost. 

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Aris Mpitziopoulos
Contributing Editor

Aris Mpitziopoulos is a Contributing Editor at Tom's Hardware US, covering PSUs.