I run 2x6970's and have experienced microstutter, super annoying since basicly it can become unplayable in xfire.
A single GPU is always prefered IMO over a multi gpu setup.
So out of the two I would go with the 580.
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Originally Posted by 3.0charlie  My knuckles are bleeding from fishing through walls a new CAT6 network cable... I found fresh, untapped electrical outlets...  | "It's all in the Reflexes"-Jack Burton |