Btw having recently run the game on both 660 Ti and 7950 I can attest that Vram usage @ 1080p no MSAA is about 1.5-1.7 gb on both
SLI is working, sort of, with almost no benefit, while Crossfire is not working at all. Well it is, perfectly, just with no fps boost
660 Ti SLI ran smoother but...