Take a good look at that anand link again. Yes it's a single GTX560TI, but notice something. Even if SLI gave you perfect 100% scaling it will usually be just a bit faster then the 7970 at 1080/1200. For example in Crysis warhead even if you doubled the 29.7FPS the single GTX560TI got, it would still be only ~5FPS faster then the 7970. You won't get 100% scaling. Might as well get the single 7970 and avoid the multi card headaches.