Crysis 2 only DX9 - DX11 will be "later" with an update

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I'm surprised you bought one in the first place.

I haven't bought NVIDIA since 8800 GTS 512MB. Burning out video cards and tuning up Crysis is all in a days work. Here's my boss' reaction: http://www.youtube.com/watch?v=QFqxn804Vmk

@CrossG: If those are your Tweaker settings then you are running High not Extreme (what you set in game is overridden). My brief testing on GTX590 had it running ~85fps so with your higher clocks I'd expect ~100.

EVGA have done a SLi patch that should fix flickering.