I switched from ATI to Nvidia because I was sick of Crossfire drivers and I've had ATI cards since the 9800pro when the Nvidia 5 series sucked so bad. However since having my 670SLI I've never had my second card on, it always drops performance and never gives any advantage and I find that sad. I mean I'd rather away to just have one card and that SLI card act as more Vram rather than it being a mirror lol. We went through a period when crossfire/Sli added to FPS and now it just does nothing, in fact 9 times out of 10 it makes my FPS worse.. Why does it even exist? It sucks!