In my opinion after using two 4870's in Xfire for 2 months, Xfire/SLI are just gimmicks so you the consumer will buy a second unnecessary video card from(ATI/NVIDIA). I was already getting good frame rates in most of my games except a few, I think the only reason I bought 2 4870's was for the Whoa factor now. I thought that I would get a good performance boost in all my games I've only seen a performance boost in 2 of the 20 games I play and that was my flight sims(DCS: BS, LOMAC). The lesson I learned seems that its better to get one very high end card instead of two high end cards. About the only thing Xfire or SLI are good for is breaking synthetic benchmarks.