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BitFenix Whisper M 850W Power Supply Review

Author: Lee Garbutt
Manufacturer: BitFenix

Specifications and Packaging

The BitFenix Whisper M 850W power supply is rated for a combined, continuous output power of up to 850 watts at 50°C operating temperature. The PSU incorporates four +12V rails that can deliver up to the full 850W capacity.  The PSU includes universal AC line input (automatically adjusts to the AC line voltage between 100 and 240 VAC) and active PFC, which makes the unit more environmentally friendly to the local power grid.  

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+12V Rail Distribution

BitFenix Whisper M 850W PSU Specifications:

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(Courtesy of BitFenix)

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Packaging and Parts

The BitFenix Whisper M 850W power supply arrived packed inside a shrink-wrapped retail box showcasing the unit’s features and specifications.  

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The power supply is protected by two thick foam inserts and all the cables and accessories are inside a black bag.

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In addition to the power supply, the box contains a power cord, mounting screws, a User Manual, wire ties, and a package of modular cables.

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(2) 4+4 pin CPU cables, (1) 24-pin ATX cable, and (4) PCI-E cables

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(3) SATA cables and (1) 4-pin Molex cable

The Whisper M 850W power supply comes with a good assortment of all modular cables. (See table above for connector count and cable lengths.)

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Note the bulky 24-pin ATX connector. The added size is due to three solid polymer caps under the hood to reduce any residual AC ripple.


February 25, 2018 | 08:51 AM - Posted by Pink Gnome (not verified)

Does the noise level table reflect the faulty power supply or the fully functioning version which they sent you later?

February 25, 2018 | 02:47 PM - Posted by Lee Garbutt

The fan noise listed is for the original PSU with the defective fan. I did not do a full re-test on the second PSU. I mainly wanted to confirm the fan was operating the way it was supposed to and it did. The fan in the second unit started up at power on and was very quiet through mid power (29.8 dBA at 3' with a background of 27.4 dBA).

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