I was looking at http://www.anandtech.com/bench/Product/292?vs=301 and its saying Radeon 6870 CF would be better then a single 6970. Right now I already have a 6870 card, so I could either buy another and Crossfire, or just buy a single 6970, what should I do? (Looking for best gaming performance)
The 6870 CF is faster and provides a much better price/performance ratio at this point in time. However, you can buy a 6970 now, and get another later if you wish. However, PCI 3.0 will be around by the time the CF 6970 will actually be used 100%. I recommend CF 6870 and get PCI 3.0 CF in the future.