I've been reading a lot of issues on the net about pre overclocked cards mainly 570/580gtx series which are having a crash to desktop in DX11 games. I have the same issue with my 580gtx sli setup. Heaven and 3D mark 2011 run smooth as butter, but when i play Crysis 2/FEAR3/Deus EX HR DX11 it sometimes crashes to desktop. I solved it by setting my pre overclocked cards back to stock settings. Maybe it helps for people who are having the same issues.