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750w or 850w for crossfire 7950

buying the parts for my pc today and i'm not sure whether i should get a 750w psu or a 850w psu
planning on getting 2 sapphire hd 7950 oc in crossfire
and dont really plan on overclocking
12 answers Last reply Best Answer
More about 750w 850w crossfire 7950
  1. 750 watts should be fine as long as it is a quality power supply. Corsair, Seasonic, PC Power and Cooling, XFX, Silverstone, Enermax or Antec.
  2. Best answer
    For a system using two Radeon HD 7950 graphics cards in 2-way CrossFireX mode AMD specifies a minimum of an 700 Watt or greater power supply. The power supply should also have a combined +12 Volt continuous current rating of 46 Amps or greater and have at least four 6-pin PCI Express supplementary power connectors.

    Total Power Supply Wattage is NOT a crucial factor in power supply selection!!! Total Continuous Amperage Available on the +12V Rail(s) is the most important.

    Even a Seasonic M12II-650 Bronze (SS-650AM), with its +12 Volt continuous current rating of 53 Amps and with its four (6+2)-pin PCI Express supplementary power connectors, is more than sufficient to power your intended system configuration.
  3. Yep. I've been recommending this one recently— XFX XXX Edition 80+ Silver: http://www.newegg.com/Product/Product.aspx?Item=N82E16817207016
  4. Eh. I don't think it's worth $30 more.
  5. kajabla said:
    Eh. I don't think it's worth $30 more.



    Actually I think the XFX is a better power supply. It gets a 9.7 from Jonnyguru.
  6. Right. Corsair's coasting on the name a bit there.
  7. Corsair needs to lose some sales to keep them honest.

    Seasonic and XFX (also really seasonic) are excellent choices.
  8. Seasonic, NZXT, OCZ, Silverstone, Thortech, XFX.
  9. kajabla said:
    Eh. I don't think it's worth $30 more.


    I am sure you meant to say US$20.

    I think it worth as it is Modular, while the XFX is Semi-Modular.
  10. ReviverSoft said:
    Just so you know, Seasonic is the OEM for Corsair (not GX/CX series) and XFX PSUs. So you can't really go wrong with any of them.

    For a Radeon HD 7950 Crossfire x2, a 750W unit will do.



    Actually the HX 750,850 and 1050 are made by CWT.

    http://www.realhardtechx.com/index_archivos/Page447.htm

    And seriously, a driver update program? That costs money? lol I hope you work for them.
  11. jemm said:
    I am sure you meant to say US$20.

    I think it worth as it is Modular, while the XFX is Semi-Modular.

    Semi-modular here means that the cables that will be used in absolutely every build (the mobo, CPU and two PCIe power cables) are not modular, and everything else is. It's no different from a fully modular PSU when used in a build. My price difference refers to the cost after rebates.
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