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Roundup: 12 Gaming Power Supplies Compared

Corsair CMPSU-AX850: Results

Efficiency meets 80 PLUS specifications:

Efficiency under different load profiles:

In the test lab, Corsair's PSU does not fully live up to its initial praise, especially in the efficiency measurements, where the CMPSU-850AX fails to reach two of the 80 PLUS Gold certification requirements. It misses one by only one percentage point, and the other by two.

Overall, the energy efficiency is still very good, and it only drops slightly at low loads. The ripple and noise results are all very good and far below the required limits. It is obvious that emphasis was placed on consistently high component quality. By passing the other tests without breaking a sweat seems to confirm this.

The Corsair CMPSU-850AX is aimed at users with high demands and is designed for continuous use, something the manufacturer underlines with a seven-year warranty. The overall high performance and quality is, however, also reflected in a lofty price.

  • FLanighan
    Why not Corsair? I jizz at my tx850w :)
    Reply
  • xxsk8er101xx
    Because it failed a few of the tests.

    FLanighanWhy not Corsair? I jizz at my tx850w
    Reply
  • p1n3apqlexpr3ss
    Corsair has a gamer series... whyd they test one of the units from the top line aimed more at enthusiasts?
    Reply
  • V8VENOM
    Odd, why isn't Silverstone reviewed at all? Most of the power supplies they looked at are junk for anyone with more than one GPU and overclocking. I dumped my PC Power & Cooling 1000 Watt PSU because it couldn't handle two ATI 5870's and overclocked CPU to 4Ghz with 1600 FSB. I put in a Silverstone 1500Watt PSU and my system has been rock solid ever since.

    The article doesn't appear to measure noise from during switching and how much noise is introduced to the CPU and bus.

    Anyway, it will be a cold day in hell before anyone gets me to switch out my Silverstone 1500 Watt PSU.
    Reply
  • scook9
    V8VENOMOdd, why isn't Silverstone reviewed at all? Most of the power supplies they looked at are junk for anyone with more than one GPU and overclocking. I dumped my PC Power & Cooling 1000 Watt PSU because it couldn't handle two ATI 5870's and overclocked CPU to 4Ghz with 1600 FSB. I put in a Silverstone 1500Watt PSU and my system has been rock solid ever since.The article doesn't appear to measure noise from during switching and how much noise is introduced to the CPU and bus.Anyway, it will be a cold day in hell before anyone gets me to switch out my Silverstone 1500 Watt PSU.You are either lying or very unlucky (got a bad PSU)......I have crossfire 5870s and an i7 965 and all stock cannot exceed 650W at the wall (about 550W actually used) no matter what I try.
    Reply
  • JamesSneed
    Nice tests but I came to a different conclusion. The seasonic X-750 is close to the most effiecent in the bunch and did you see that voltage ripple it looked like it was flat lining.
    Reply
  • boiler1990
    For the ~$20 price difference between the Corsair 850HX and the AX850, I think I'll get the AX. It never hurts to invest in a great PSU :)
    Reply
  • juuh
    V8VENOMOdd, why isn't Silverstone reviewed at all? Most of the power supplies they looked at are junk for anyone with more than one GPU and overclocking. I dumped my PC Power & Cooling 1000 Watt PSU because it couldn't handle two ATI 5870's and overclocked CPU to 4Ghz with 1600 FSB. I put in a Silverstone 1500Watt PSU and my system has been rock solid ever since.The article doesn't appear to measure noise from during switching and how much noise is introduced to the CPU and bus.Anyway, it will be a cold day in hell before anyone gets me to switch out my Silverstone 1500 Watt PSU.
    I call BS. I could run your setup with my PC power & cooling 750w unit.
    http://www.techspot.com/review/289-geforce-gtx-480-sli-versus-radeon-5870-crossfire/page9.html
    Reply
  • vanhalen
    No recommendation for the Seasonic? Am I missing something?
    Reply
  • random1283
    agreed no reccomendation for an x series seasonic, you guys must be mssing something, every other review of the x series said that they are simply amazing much better then any nxzt or anything.
    Reply