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280x crossfire psu

You should be able to get away with a 650w PSU as Overclockers did a special deal with the Superflower 650w PSU and 2 280 cards.

But I personally would look at 750w.
 
750-850w should cover you nicely.
They'll use around 500w give or take, depending on overclocking.

This.

750W was not enough for my 7950's on extreme overclocks on Firestrike or Sleeping Dogs mind you. 850W will be enough. 750W should be fine in most cases though.
 
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