Bitfenix Whisper Series 550W PSU Review

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Cross-Load Tests And Infrared Images

Our cross-load tests are described in detail here.

Load Regulation Charts

Efficiency Chart

This is one of the most efficient 550W Gold-rated PSUs we have ever tested. Its best spot is between 175W and 270W, where it delivers over 92% efficiency when the minor rails stay below 25W combined load. The BWG550M is able to exceed 90% efficiency for a much wider range, starting from around 90W to 450W.

Ripple Charts

Infrared Images

Toward the end of the cross-load tests, we took some photos of the PSU with our modified FLIR E4 camera that delivers 320x240 IR resolution (76,800 pixels).

Thanks to increased efficiency, temperatures inside the PSU remain low.

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Aris Mpitziopoulos
Contributing Editor

Aris Mpitziopoulos is a contributing editor at Tom's Hardware, covering PSUs.