Which PSU is best for my setup?

Hey guys, I was wondering which psu would be better for a system that has two radeon hd6950's (unlocked shaders and overclocked to 6970) in crossfire setup and a i5-2500k cpu with a moderate overclock.

XFX 650W XXX Edition P1-650X-CAG9 Power Supply Sealed
http://compare.ebay.com/like/200592013017?var=lv&ltyp=AllFixedPriceItemTypes&var=sbar&rvr_id=223765578391&crlp=1_263602_309572&UA=%3F*S%3F&GUID=3450b25f12f0a47a44a1f501fedcd78f&itemid=200592013017&ff4=263602_309572

XFX 650W XXX Edition P1-650X-CAH9 Power Supply Sealed
http://compare.ebay.com/like/170601897239?var=lv&ltyp=AllFixedPriceItemTypes&var=sbar&rvr_id=223769663857&crlp=1_263602_309572&UA=%3F*S%3F&GUID=3450b25f12f0a47a44a1f501fedcd78f&itemid=170601897239&ff4=263602_309572

or

Corsair CMPSU-650TX 650-Watt TX Series 80 Plus Certified Power Supply
http://www.amazon.com/Corsair-CMPSU-650TX-650-Watt-Certified-Supply/dp/tags-on-product/B000X24ISU
7 answers Last reply
More about which setup
  1. The XFX units are more efficient and feature modular cables.
    Any one of those units would be fine.
  2. Whats your budget as personaly for your system i would be thinking of something with a little more Wattage,

    http://www.newegg.com/Product/Product.aspx?Item=N82E16817139021

    CORSAIR Enthusiast Series TX750 V2 750W ATX12V v2.31/ EPS12V v2.92 80 PLUS BRONZE Certified Active PFC High Performance Power Supply
  3. http://www.newegg.com/Product/Product.aspx?Item=N82E16817207003

    XFX Black Edition P1-750B-CAG9 750W ATX12V v2.2 / ESP12V v2.91 SLI Ready CrossFire Ready 80 PLUS SILVER Certified Modular Active PFC Power Supply
  4. Uther I heard its not about total wattage. It's about the amount of amps put out by the 12v rail. For instance some 750 w psus are worse than 650w psus and some 500w psus are worse than 450w psus.

    I could be wrong though. Please correct me if I am.
  5. You are correct in that not all power supplies are equal and it is about 12v amps. However I think you are pushing it trying to Crossfire unlocked 6950s with 650 watts. I would recommend a 750w unit. That XFX unit that Uther linked to is a great choice.
  6. Different thread, but once again...

    I love you.
  7. Seriously, I usually at least get dinner and a movie before the I love yous start. :kaola:

    But once again , glad I could help.
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