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CrossFire 6950 2GB Power Requirement

Last response: in Systems
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July 11, 2012 10:51:14 PM

Hey guys,

I'm looking into increasing the graphical power of my gaming rig here soon.

A brief list of my specs are below:

  • OCZ ModXStream Pro 700W Modular Power Supply
    http://www.newegg.com/Product/Product.aspx?Item=N82E168...
  • Sapphire Radeon HD 6950 2GB *Unlocked*
    http://www.newegg.com/Product/Product.aspx?Item=N82E168...
  • ASUS P7P55 LX motherboard
    http://www.newegg.com/Product/Product.aspx?Item=N82E168...
  • Intel i5 760 overclocked to 4.0GHz
    http://www.newegg.com/Product/Product.aspx?Item=N82E168...
  • 2 sticks of DDR3 memory (2x2GB)
    http://www.newegg.com/Product/Product.aspx?Item=N82E168...
  • Samsung 1TB 7200 RPM Hard Drive
    http://www.newegg.com/Product/Product.aspx?Item=N82E168...
  • Cooler Master Hyper 212 CPU cooler w/ 4 chassis fans
    http://www.newegg.com/Product/Product.aspx?Item=N82E168...
  • Thermaltake Armor A90 Mid-tower Case
    http://www.newegg.com/Product/Product.aspx?Item=N82E168...
  • LITE-ON 24X DVD Writer
    http://www.newegg.com/Product/Product.aspx?Item=N82E168...

    One route I'm thinking of doing is simply getting another 6950 2GB (unlocked).

    What I need to know though is if my power supply would have enough juice to support the system with both cards in Crossfire?

    Any other suggestions and feedback would be greatly appreciated. Thanks guys!
    July 11, 2012 11:05:36 PM

    a psu calculator just add all the details and you'll know what watt psu needed
    July 11, 2012 11:08:05 PM

    Yeah but I've heard many of them are unreliable. I've researched some articles that say a 600W PSU would be sufficient enough but according to some calculators they recommend a 950W. That's why I decided to ask the community itself. :) 
    Related resources
    a b B Homebuilt system
    July 12, 2012 12:20:15 AM

    I run two Asus 6950 2Gb's and a 4.5GHz clock on a Tx 850 but the 700w should manage depending on your overclocking intentions, although you will require some adaptors for that second card
    Moto
    July 12, 2012 1:14:21 AM

    Motopsychojdn said:
    I run two Asus 6950 2Gb's and a 4.5GHz clock on a Tx 850 but the 700w should manage depending on your overclocking intentions, although you will require some adaptors for that second card
    Moto


    Moto, you mind telling me your relative wattage during full load with that setup?

    I won't be overclocking the CPU any more than it is now, due to 4GHz being the max that CPU can go before an increase of voltage outweighs the benefits of added MHz, and for the time being I only plan on having both cards unlocked, and will overclock them as needed when I figure out how much wiggle room I have. You know what I mean?
    a b B Homebuilt system
    July 12, 2012 7:42:53 AM

    I'm actually away until monday now but I can check 4GHz wattage on Hw monitor when I get back for you,
    my cards are 810/1200, I don't clock them :) 
    Moto
    !