renz496 :
for those who are interested with 3 way setup:
http://www.hardocp.com/article/2012/04/25/geforce_gtx_680_3way_sli_radeon_7970_trifire_review
That review has some pretty strong criticism for Crossfire:
"Therefore, in summary, on the whole GTX 680 3-Way SLI provided the best actual experience gaming. Framerate does not tell all, and it often doesn't show you how a game feels when you are playing it. We have said it before, and we'll say it again, SLI feels better than CrossFireX, it feels smoother, and is more fluid. With CrossFireX you have to achieve higher framerates in order for it to feel as smooth as SLI does."
"Driver Woes for AMD Again
We've given AMD a hard time in the past about driver support, deservedly so. This is unfortunately for AMD another moment we need to bring the lacking driver support to our readers’ attention."
"By the time this is fixed hopefully in Catalyst 12.5 in May, it will be five months from the release of the AMD Radeon HD 7970. That is nearly half a year, or half the lifetime of the new GPU. It's approaching upon the time you usually see product refreshes. That is a rather long and frustrating time for not having functionality support except with your earliest possible Release Candidate driver."
"We've generally been disappointed in CrossFireX support this generation, and we know our readers have too. It prompted us early on to write an editorial on the issue because we know our readers and enthusiast gamers out there are having these same issues and are quite frustrated with it. This is yet one more issue to throw into the bucket, and the bucket is getting rather full. We hope this issue gets fixed soon, but we are not surprised to see people jumping ship to NVIDIA because of AMD driver issues. More and more these topics are posted in our forums, and we can't blame them. NVIDIA clearly has a leg up on SLI and NV Surround support. Combine that with the smoothness and fluidity difference between SLI and CrossFireX, it makes selling CrossFireX or Tri-Fire plus Eyefinity a hard sell."