Enjoy the card mate, I have a gtx 580 1.5gb CUii and it's flying threw the game too, SLI or CFX on high end cards is not needed for this game unless you want to game at 120 FPS constant on a single screen
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, you only need SLI or CFX for multi screen setups and resolutions like 2500 x 1600 with lots of AA. It looks stunning and I have really enjoyed playing it in SP and MP. I think the topic of 3gb cards required is well and truly buried now. People that judge beta code on what the release code will be is silly as we have seen now, release code goes threw massize amounts of optimising and bugs removed that can cause memory leaks to fill up VRAM with useless data as we see and new drivers for the games are written to make sure the new code runs well and does not cause memory leaks to fill the VRAM up with useless data too.