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thats a ton of potential heat ick
http://www.gpureview.com/show_cards.php?card1=638&card2=664#
there appears to be a better memory bus on the 7950 so those might give a slight edge in performance
i would expect much more performance with quad but only if your app supports it
if those cards are collecting dust i'd sell em before the newer r9/r7's get released
Well, USCM, i'm not entirely sure why you haven't tried a multicoin pool that mines most profitable altcoin and autodumps to BTC...but...
Here's the 6970 vs the 7950 (non Boost).
As you can see, the 7950 absolutely destroys the 6970, on top of being a bit more efficient.
I'd therefore not even consider the 6970s.
Try the tri or quad 7950s, but i would think that the quad 7950 setup would be more stable due to the even number of cards. AMD drivers, you know how they work sometimes.