Currently there are problems with SLI and multi-monitor, you take a big hit on performance.

I have 2 gtx580's in SLI and 3 monitors giving me 5760x1200 game resolution. In 1.0 I could run max settings like this, but now I have to resort to low laptop settings, which is definitely not as it should be. The game doesn't look bad, but it definitely could look better. Also affects the draw distance as well. A single gtx580 runs the game at max on a single 1920x1200 monitor at 60fps and 80% gpu usage. On max with SLI enabled for nvidia surround, I get 10fps at most, if I go around water, 1fps and I can't move.

I have an intel i7 950, and at most I see 15-20% cpu usage, so I'm pretty pleased with that performance. I even have it set to use CPU for physics. However, my Q6600 sees 80-90% cpu usage for basic settings with a gtx 280, so making the step to the i7 series makes a huge difference.