Bitfenix Whisper Series 550W PSU Review

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Pros, Cons, And Final Verdict

The BWG550M is a nice surprise from Bitfenix, and there is no doubt that CWT's new GPU platform is a great performer. This 550W member of the Whisper family registers tight load regulation, excellent ripple suppression, high efficiency, and good transient response. Plus it's equipped with all of the protection features that matter. Build quality is great and only highly-regarded Japanese capacitors are used inside, including many polymer caps that don't have a problem working effortlessly under high ambient temperatures.

Modular cabling and quiet operation are two of this unit's other key features. More important, though, is an aggressive suggested retail price. Set just under $80, even tough opponents like Corsair's RM550x and EVGA's 550 G2/G3 have a hard time distinguishing themselves. At long last, a worthy opponent has emerged. This will push companies already dominating in the PSU market to lower prices and push innovation.

After its fairly weak Fury Gold line, Bitfenix makes a strong return with the Whisper family, which has all of the credentials needed for an emphatic recommendation. In addition, CWT proves once more that it is one of the best PSU manufacturers by creating an affordable high-performance platform. We also like that every cable except for the ATX one doesn't lean on filtering caps, which would make them bulkier.

If you are building a mid-range PC, the 550W Whisper unit should be at the top of your shopping list. Bitfenix and CWT seem to trust it, otherwise they wouldn't protect it with a seven-year warranty. The only downsides we spotted were the not-so-efficient 5VSB rail and the HDB fan, which doesn't have the rated lifespan we'd expect from coolers leveraging similar technology. As we mentioned, though, if Bitfenix was unsure of this fan's reliability, the company wouldn't stand behind it with an extra-long warranty. Our last complaint concerns the main ATX cable, which consists of two connectors that can be difficult to hook up. Bitfenix should provide more flexibility to those connectors, making the installation process easier. Until then, we recommend attaching the ATX cable before screwing the BWG550M into place.

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Contributing Editor

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

  • turkey3_scratch
    Bitfenix did the right thing pairing with CWT here. This is a great unit!
  • Aris_Mp
    Indeed, its performance was a nice surprise for me as well. It's good to see some new competition in this market.
  • Nuckles_56
    Damn, I wonder what Australian pricing will be like for this unit, as I'd be almost tempted to replace my current PSU with a quieter one like this if it is priced well
  • MarekRMac
    Hi, please give me quick advice: Bitfenix Whisper M 550W or Corsair RM550x ?
  • Aris_Mp
    19083753 said:
    Hi, please give me quick advice: Bitfenix Whisper M 550W or Corsair RM550x ?

    Which ever you can find at a lower price. Performance wise they are very close.

  • jonnyguru
    One noticeable difference between the RMx and the Whisper is that the RMx uses an MCU for the fan controller instead of the standard thermistor/transistor circuit in the BitFenix product.