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CrossfireX XFX 5770's Enough Power?

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>>PhoeniX<<

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Ok so I am running an NZXT HALE90 850w Power supply and I am wondering if it will be enough to power Crossfire'd 5770's.

Also the 5770 has only one 6pin PCIe Power and my power supply cord has two. Considering I only need one of them can I use the other one (For if a card had 2x PCI power) to power my second card? Just wonderin if I can save some space.

Thanks >>PhoeniX<<
 
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