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PSU to run 5870 CrossFire?

Hey so I have a quick question concerning this combo here:
http://www.newegg.com/Product/ComboDealDetails.aspx?ItemList=Combo.421101
That's the 650W XFX PSU and it apparently has 52A available on one rail. Is this amperage sufficient to have 2 5870's in CrossFire? Or would I need substantially more amps on one or multiple rails like the Antec 750W?

Antec EarthWatts 750W PSU:
http://www.newegg.com/Product/Product.aspx?Item=N82E16817371026&cm_re=antec_750W-_-17-371-026-_-Product
~4 12v rails
~25A per rail
___________________
100A total across 4 rails


*Edit: I should note that the XFX PSU does indeed have 4 6pin PCI express connectors.

Any input or knowledge concerning the subject would be greatly appreciated, thanks!
5 answers Last reply Best Answer
More about 5870 crossfire
  1. You need at least a good quality 750-850 watt unit perferbly Antec or Corsair. XFX are ok power supplies but for what they cost you can get much better for your money, but that 650 watt unit is not enough to crossfire two 5870's.

    I wouldn't go any less then this for two 5870's
    Antec TP-850
    http://www.newegg.com/Product/Product.aspx?Item=N82E16817371009

    or

    Corsair 850TX
    http://www.newegg.com/Product/Product.aspx?Item=N82E16817139009

    I suggest going with 850 watt units for overclocking headroom and better efficiency at load, but a 750 watt unit will work.
  2. Both could run twin 5870s.
    However, I recommend the Antec EarthWatts, which is much better than the XFX.
  3. Best answer
    Here you have some good options:

    ANTEC TruePower New Blue 750W (by Seasonic) (modular)...90$ (after $25.00 Mail-In Rebate)
    http://www.newegg.com/Product/Produc...82E16817371022

    XFX XXX Edition 650W (by Seasonic) (modular)...$90 (after $10.00 Mail-In Rebate)
    http://www.newegg.com/Product/Produc...82E16817207002

    THERMALTAKE ThoughPower XT 775W (by CWT) (modular)...$95 (after $30.00 Mail-In Rebate)
    http://www.newegg.com/Product/Produc...82E16817153127

    CORSAIR TX750 750W (by CWT)...$100 (after $10.00 Mail-In Rebate)
    http://www.newegg.com/Product/Produc...82E16817139006

    CORSAIR HX650 650W (by Seasonic) (modular)...105$ (with Rebate)
    http://www.newegg.com/Product/Produc...82E16817139012

    I recommend you to go for the ANTEC TruePower New Blue 750W, altough the THERMALTAKE ThoughPower XT 775W is an excellent option too. The model from Antec is a bit cheaper, has longer cables and better power mosfets in the in the active PFC and switching section. On the other hand, the unit from Thermaltake presents a bit higher efficiency and wattage and less cables attached to the PSU (better modularity).
  4. Wow, thanks for the fast responses you guys!
    I think I may actually go with that Antec 750W. I found a nice combo with it and some RAM.
  5. Best answer selected by secranox.
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