The updated drivers reduce performance in DX11 in Natural selection 2 due to the SLI bits they use. The game is using 0x000000F5 (DX SDK DetailTessellation11 sample, Star Trek: Online)... instead of 0x000600F5 (S.T.A.L.K.E.R.: Clear Sky). 0x000600F5 yieleds much better performance. Further more, when I change the SLI bits to ones which I know work better (from 0x000000F5 to 0x000600F5)... I now get shadow flickering. This behavior was not evident in 327.23 although it is visible in 331.40. I reverted back to 327.23 and the game is running extremely well with no shadow flickering in DX11. Just thought I would let this be known.