If you were going for a god system with Sandy Bridge-E and QUAD 580s, would a fourth GFX lower performance? I read on Google and such that QUAD SLI would actually lower performance relative to a TRI SLI set up. Lets say if you had a mobo that supported x16 all across, would that still lower performance? Or is that the problem, no mobo supports x16 all across? Is it driver problems?