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The fan inside is a 135mm hydro dynamic bearing model by Martech (model number DF1352512SEHN). It is a 12V DC, 0.60A, 7.20W model. The fan is always active as this power supply does not incorporate a semi passive mode.
Below a GALLERY showing the internal design of the BitFenix Whisper M Series 850W
The CWT ‘GPU' design is pretty clean overall with good soldering throughout. The primary side of the supply adopts a half bridge topology with an LLC resonant converter. On the secondary side there is a couple of DC-DC converters for generation of the minor rails. Both of these converters are mounted on a vertical board.
Transient filtering starts at the AC receptacle with an X cap and two Y caps. Power cables are wound around a ferrite ring to help reduce EMI. The secondary stage of transient filtering is on the main PCB and it consists of an X cap, two Y caps, two CM chokes and an MOV.
The primary capacitor is a high grade 105C rated Japanese model by Nippon Chemi Con, from their KMR series to be specific. It is rated 400v 680uF. All electrolytic capacitors are rated 105c, which is good to see.
I know some people like to turn their PSU’s fan side up but not in a windowed case with that PSU, that’s damn ugly, it looks like it was cut by a first year student on a day course. I’d keep an eye out for the Superflower Leadex Gold 850w in white (which I have) or black which occasionally drop down to a very similar price and are a work of art.