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Corsair AX850 850W Power Supply Review




Price Per the Watt:

Power Supply Corsair AX850 850W at $199.99 = $0.23/Watt (08-2010)


The Corsair AX850 performed very well during testing.  However, following the OCC testing methodology, the efficiency figures were a little disappointing, especially on 110 VAC at full load. It is certified by the 80 Plus organization to meet the requirements of the Gold standard; if I could replicate the results at the same DC loading and AC input then maybe it would meet the said standard, but it would be unfair to downgrade the power supply in any way because the power supply will be optimized by Corsair to meet the standard at particular AC input and DC loading levels. DC voltage load regulation and AC ripple/noise are excellent, which really are the most important factors when on the hunt for a suitable power supply for benching and high end gaming rigs. Don’t get me wrong, I’m all for saving precious resources and an 80 Plus certified power supply should be a must; it assures a certain level of quality in itself.

What I really like about the Corsair AX850 is the silent fan control technology and the results it produces. Let’s face it, you’re not going to get silence when used in an high end dual graphics card set up playing a round of Crysis and it wouldn’t really benefit me because I usually fold when not gaming and the loudest thing I hear is my graphics card fan, a quiet power supply really wouldn’t make much difference. It will benefit the gamer that likes a silent PC while at the desktop, surfing, or using productivity software and enjoys quiet while gaming on a single high end graphics card.

The Corsair AX850 performed very well during testing but it didn’t quite hit the efficiency marks expected following the OCC testing methodology, but 89% isn’t too bad, is it? It comes highly recommended and I have no hesitation in awarding it an OCC Gold award.



  • Excellent DC voltage load regulation
  • Low AC noise/ripple
  • 80 Plus Gold certification
  • Silent fan control technology
  • Seven year warranty
  • Plenty of connectors



  • Unexpected efficiency of 83% at 100% DC load on 110 VAC (following the OCC testing methodology)
OCC Gold

  1. Introduction & Closer Look
  2. Closer Look (The Power Supply)
  3. Specification & Features
  4. Testing: DC Voltage Load Regulation
  5. Testing: Efficiency, Power Factor & DC Quality
  6. Testing: Temperature, Noise Level & Fan Speed
  7. Conclusion
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