crossfire or sli

Neither is better or worse, and most games on the market don't utilise either. Or they do, and scale badly. IMHO, Single cards are the way to go.
 
Crossfire tends to have better scaling than SLI. About 70% performance boost with Crossfire and a little less with SLI in synthetic benchmarks. Of course this is 2 cards. 3 cards and the performance increase drops massively.
 
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