Recommended PSU for Two HD 5970's in CrossfireX?

Each one of these cards pulls 300W of power at 100% load. So Two of them would pull at least 600W from your PSU.

Should a 1200W power supply be enough? Would a 1000W work?
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  1. Hello ambam;

    SapphireTech a HD 5970 MFGR suggests 1200W for CrossfireX of two if it's cards. SAPPHIRE HD5970 4GB system requirements

    Depending on what else you're powering with your PSU you can probably get by with a very high quality 1000Watt PSU.
  2. Even a quality 900W works, the 5970 sips power (compared to the Fermis), and you only need ~200W for the rest of the system.

    On the Low-end, even this would be enough: http://www.newegg.com/Product/Product.aspx?Item=N82E16817121075

    But if you dont mind spending, get the Corsair AX-1200.
  3. Put 4x 8pin PCI-e connectors on your PSU shopping list. The HD 5970 wants 2 of the 8pin power connectors.
  4. Timop said:
    Even a quality 900W works, the 5970 sips power (compared to the Fermis), and you only need ~200W for the rest of the system.

    On the Low-end, even this would be enough: http://www.newegg.com/Product/Product.aspx?Item=N82E16817121075

    But if you dont mind spending, get the Corsair AX-1200.


    The HD 5970 (at stock clock speeds and voltages) uses 300W of power running at 100% load. If highly overclocked, it can use about 400W.

    I can't believe the Nvidia Fermi actually uses more power than a dual-GPU card.
  5. ambam said:
    The HD 5970 (at stock clock speeds and voltages) uses 300W of power running at 100% load. If highly overclocked, it can use about 400W.

    I can't believe the Nvidia Fermi actually uses more power than a dual-GPU card.

    It does, the GTX480 takes about 320W maximum.
    http://www.techpowerup.com/reviews/NVIDIA/GeForce_GTX_480_Fermi/30.html
  6. ambam said:
    I can't believe the Nvidia Fermi actually uses more power than a dual-GPU card.
    Here are some video card power consumption figures measured by TechPowerUP (video cards alone, not the entire system)
  7. WR2 said:
    Here are some video card power consumption figures measured by TechPowerUP (video cards alone, not the entire system)


    So my Corsair TX850 850W PSU is more than enough for a single HD 5970? Most of the time the power consumption will be well below 300W, even during intense gaming.

    The only way to load up an HD 5970 to 100% is to use furmark. Not even Crysis on very high resolutions and AA can push a GPU as hard a furmark can.
  8. Correct. A Corsair TX850 is far above the 'average generic 850w' PSU that the Sapphire 5970 recommendation covered.
    Crysis maxed out is going to get you something like the peak consumption for the video cards and the rest of the system components.
    The typical peak consumption leaves plenty of room for the rest of the system, including overclocking and future expansions (extra HDDs/SSD, etc)

    Corsair 850TX review @ Jonny Guru
  9. WR2 said:
    Correct. A Corsair TX850 is far above the 'average generic 850w' PSU that the Sapphire 5970 recommendation covered.
    Crysis maxed out is going to get you something like the peak consumption for the video cards and the rest of the system components.
    The typical peak consumption leaves plenty of room for the rest of the system, including overclocking and future expansions (extra HDDs/SSD, etc)

    Corsair 850TX review @ Jonny Guru


    The rest of my setup includes the following.

    Core i7 930 @ stock speeds
    MSI Big Bang X-Power X58 motherboard
    6GB DDR3 1333 MHz tri-channel
    DVD-ROM
    2TB Hitachi 7200 HDD
    ZALMAN CNPS9900 CPU cooler

    How much power do you think the rest of my system takes up?
  10. If TechPowerUp is right about the idle power draw we can look at some other i7 930 reviews with systems pretty similar to your yours and make a couple guesses... a bit under 100watts idle and 200watts under CPU load, 2D graphics only.
  11. Double checking a few more reviews that looks a bit low, but not too far off.
    Check the THG 5970 review: Power, Noise, And Heat and test system specs
  12. if you want to play it safe and get more or less the best, try this out:

    http://www.zipzoomfly.com/jsp/ProductDetail.jsp?ProductCode=10012766

    or of course just get these:

    http://www.newegg.com/Product/Product.aspx?Item=N82E16817371032

    http://www.newegg.com/Product/Product.aspx?Item=N82E16817194046

    as far as 2 5970s, yes, you can get away with 1000watts generally, but i wouldnt want to play around with hardware like that.
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