what it says in comment need cpu 850 w that could cope with with w cards or 2 cards with 2 cardsa that have 2 gpu each need to to have 4 pin connectors to
I'll just answer what I suspect the question to be. If you want to go for SLi or Crossfire with two high end video cards then an 850w PSU might come in handy but for almost every other situation a good 500w PSU will do. If you are asking about the 3870X2 in Crossfire then you could buy an 850w PSU but something like the Corsair HX 620w should power it no bother.
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