BitFenix is a comparatively new company that quickly became an established brand name via their PC case designs. Today BitFenix is still focused primarily on cases but the company is slowly diversifying, offering supplies for case mods, audio products, and power supply units (PSUs). Ever since the company’s founding in 2010, we reviewed several of their case designs, but not any of their other products. Today we are having a look at their recently released ATX PSU series, the Whisper M.

The Whisper M is not BitFenix’s first attempt to diversify towards the PSU market. Their first attempt was about three years ago with the Fury series, a PSU series that heavily weighted towards aesthetics and with a relatively hefty price tag at the time of its release. This time around BitFenix is taking a somewhat different approach, trying to balance performance with aesthetics, all while maintaining a competitive price tag, especially in a very competitive market.

BitFenix Whisper M series - MSRP Prices
BWG850M BP-WG850UMAG-7FM $119
BWG750M BP-WG750UMAG-7FM $109
BWG650M BP-WG650UMAG-7FM $89
BWG550M BP-WG550UMAG-7FM $79
BWG450M BP-WG450UMAG-7FM $69

The Whisper M series consists of five units ranging from 450 to 850 Watts, in 100 Watt steps. In this review we are having a look at the top and tail of the series, the 450W and the 850W units. Both units are fully modular, they boast impressive on-the-box performance specifications, they are 80Plus Gold certified and get that rating at 50 °C, all while parading with a 7-year warranty. The Whisper M units also have a multi 12V rail design, which is something that we have not seen being implemented in quite some time. The MSRP pricing is $69 and $119 for the 450W and the 850W units respectively, which is be more than reasonable if the units prove to be good performers.

BitFenix Whisper M 450W ( Rated @ 50 °C )
AC INPUT 100 - 240 VAC, 50 - 60 Hz
RAIL +3.3V +5V +12V +12V2 +12V3 +5Vsb -12V
MAX OUTPUT 20A 20A 25A 25A 25A 2.5A 0.3A
100W 450W 12.5W 3.6W

BitFenix Whisper M 850W ( Rated @ 50 °C )
AC INPUT 100 - 240 VAC, 50 - 60 Hz
RAIL +3.3V +5V +12V +12V +12V +12V +5Vsb -12V
MAX OUTPUT 22A 22A 25A 25A 40A 40A 2.5A 0.5A
120W 850W 12.5W 6W

Packaging and Bundle

The company supplies the Whisper M series in an aesthetically simple but practical cardboard box. Although the artwork is limited to a partial picture of the unit itself, the rear and sides of the box are full of graphs and charts that depict all of the unit’s core features. One could notice that the text could use some editing by just looking at the front of the box, where it reads “Silence Perfromance” (two nouns, one of them misspelled). The walls of the box are very strong and the unit is packed between thick polyethylene foam pieces that are offering ample shipping protection.

Most likely in an effort to keep the costs low, BitFenix supplies only the basics alongside with their Whisper M PSUs. Inside the box we only found the necessary AC power cable, a few cable straps, four black mounting screws and a basic user’s manual (with the same spelling error). Both units share the exact same bundle, only the number of the supplied modular cables differs.

All of the Whisper M units are fully modular, with “flat” ribbon-like cables. The wires and the connectors are all entirely black. An interesting feature here is the bulky connector of the 24-pin ATX cable. The large plastic cover is not there solely for aesthetic purposes but it actually hides three solid-state capacitors that are being used for extra ripple suppression. This is the first time that we have seen the designer of a PSU employing capacitors outside of the unit’s body. 

Connector Whisper M 450W Whisper M 850W
ATX 24 Pin 1 1
EPS 4+4 Pin 1 2
EPS 8 Pin - -
PCI-E 6+2 Pin 2 6
PCI-E 8 Pin - -
SATA 8 12
Molex 4 4
Floppy - -
The BitFenix Whisper M 450W & 850W PSUs
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  • Chaitanya - Wednesday, February 15, 2017 - link

    Those cables certainly look nice, especially the 24pin cable.
  • HomeworldFound - Wednesday, February 15, 2017 - link

    The 24pin cable looks pretty good. The 24pin ATX cable has really gotten annoying for me. Is there no way to further innovate in that area?
  • The_Assimilator - Thursday, February 16, 2017 - link

    Barring another revision of the ATX spec, the best we can hope for is right-angled 24-pin connectors on motherboards a la EVGA.
  • DanNeely - Thursday, February 16, 2017 - link

    As stagnant as the desktop's become about the best we could hope for is to declare about 1/3rd to 1/2 of the pins in the big connector optional (-12v, most of the 3.3/5v, and a few of the corresponding grounds) and have a big sparsely wired connector.

    I'm not sure a right angle 24pin socket is actually a good idea in general. Cable routing is far worse with it in a compact case without wiring space behind the mobo. Even if you have wiring space behind the mobo, it's still a much more cramped space to be trying to make the tight bend you need to get it into position. It also makes having a cable hole mis-aligned with where the mobo connector is a lot more problematic; with a vertical socket you can just feed an extra few inches up to shift to the side, horizontally not so much. Lastly I'd be a bit leary about it just in terms of general strain relief. The great big fat cable can pull on the socket really hard if it's alignment is off and a tall cable loop coming up gives a lot more potential slack to dissipate the force than a tight 180* turn coming through the cable hole.
  • BrokenCrayons - Wednesday, February 15, 2017 - link

    It's easy to overlook a typo on the box to pick up a very reasonably priced PSU with high efficiency and good test results. The absurdly long warranty is a bonus. I think we've got a winner here.
  • jardows2 - Thursday, February 16, 2017 - link

    Maybe it's intentional, and should be read as Perf-Romance - as in you'll fall in love with the "perf" of this product!
  • fire400 - Sunday, February 19, 2017 - link

    lol.. great marketing strategy
  • Drumsticks - Wednesday, February 15, 2017 - link

    How does this compare to the RM550x, which made it onto your best of list last year?

    It looks like a pretty good unit, though, and for a little bit less than the 550x. Hopefully we can see more stock like you said. I can't find it in the US at all.
  • fanofanand - Wednesday, February 15, 2017 - link

    These PSU reviews might not gather as many comments or as much appreciation, but the next time someone is putting together a new build they will appreciate the time and effort spent. BitFenix has been doing some really great things lately and it looks like this PSU will continue that trend. Nice job with this review.
  • wolfemane - Wednesday, February 15, 2017 - link

    I really wish this review had come out just a few days earlier. Wound up getting a RM550x for a bit more. BUMMER!

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