I'm playing at 1600,1200 in DX10 using Vista Home Premium, with all settings on 'Very High' and 4x AA. I'm getting around 50/60FPS.
I don't see SLi making any difference whatsoever though, enabling/disabling it and my frame rate stays the same.
I get a drop in frames when increasing the AA...8x is giving around 40FPS and 16x is around 18FPS.
That sounds pretty **** from a system like mine...but apparantly the performance issues are to be resolved in next months patch?
Thanks for the heads up
Loving Crysis thus far.