How big psu i need?

im going to a new pc and i dont know how big psu i need?im buying intel i7 2600k and hd 6870(crossfire later)
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  1. A GOOD 750W will be enough for 6870x2. I.e. Corsair, Seasonic, XFX, PC Power, and Silverstone.
  2. Indeed. Even a 650W from above could do it.
  3. The title of this topic has been edited by Pyree
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