270X crossfire question

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Jun 18, 2014
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I'm going from a Z68 micro atx Board to a Asus deluxe Z77 board which is full ATX. I have a 270X on RMA right now and am thinking of buying a second is it worth it to buy the second 270X (its going to be like 150 from a friend) or go for a 970.

Note I have a 750W EVGA supernova G1 PSU.