Power supply needed

If i wanted to run a single ATI video card i know a 650w is plenty what power supply would i need if i wanna run 2 ATI video cards.. Mind there is a ASUS Crosshair IV Formula AM3 board, and a AMD Phenom II X6 1090T Black Edition Thuban 3.2GHz.. do i need more power?
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More about power supply needed
  1. What cards are you going to run in CF ?
  2. Maybe like a hd 5000 series
  3. what are your thoughts on a XFX HD585XZABC Radeon HD 5850 Black Edition Video Card - 1GB GDDR5, PCI Express 2.0
  4. For 2 5850's, a good 650W PSU such as Corsair HX 650W suffices.
  5. Aww Maziar, you're no fun today; I was going to suggest that a 300W PSU would have no trouble with a pair of HD5450s...

    Anyway, for a pair of HD5850s, the operative word here along with the 650W was "good." Quality modern PSUs have full range active PFC (no little voltage switch) and 80+ certification. Antec, Seasonic, Corsair, Enermax, and XFX are among the better brands. Other than Enermax, avoid any PSU with "max" in its name, as it is most likely a reference to the size of the pyrotechnic display or the number of parts it will take with it when it dies.
  6. With this psu:

    http://www.thermaltake.com/product_info.aspx?PARENT_CID=C_00001568&id=C_00001572&name=Toughpower+XT+875W&ov=n&ovid=

    You can crossfire all these cards you see here:

    http://sites.amd.com/us/game/products/certified/Pages/certified-power-supplies-details.aspx?item=525

    Is Ati’s official site and the tests they made.
    Is 875watts, 80 bronze, PSU and will fully cover your in feature.
  7. It's also overkill, and when he's sitting at the Desktop or otherwise [mostly] idle, he'll be running it around 10% of capacity where efficiency will absolutely suck.

    I'd probably choose a Seasonic X-650. It is over 88% efficient at 9.6% load.
    http://www.jonnyguru.com/modules.p [...] 2&reid=169
  8. Yep,Seasonic X650 is also good(I think its cheaper than Corsair HX650 too)
  9. 80 bronze means you get near to 90% gold is near to 100% but expencive.

    All the PSUs and their test:
    http://support.amd.com/us/certified/power-supplies/Pages/listing.aspx

    All the PSUs and the Crossfire tests they made:
    http://sites.amd.com/us/game/products/certified/Pages/certified-power-supplies.aspx

    The ati sites can cover any quation he has.
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