Here's what I've tryed by now.
Crysis (DX10):
Runs smoothly at maximum quality with no probs and with no performance loss compared to Windows 7.
Crysis 2 (DX9 / DX11*):
Runs smoothly at hardcore quality sttings in 1600 x 1050 resolution in DX9 mode. Still waiting for Crytek DX11 patch.

Lost Planet 2 (DX9 / DX11):
Runs quite smoothly at maximum quality in both DX9 and DX11 modes, but performance isn't as good as in Windows 7. I think it's because of the default WDDM 1.2 driver that says Radeon HD57xx Engineering Sample, but I have a Radeon HD6870.
F1 2010 (DX9 / DX11):
F1 2010 works great in both DX9 and DX11 modes with no performance or graphics bug, though I never ran the game in Windows 7 to compare.
Need for Speed SHIFT 2 Unleashed (DX9):
Runs perfectly at maximum quality with no probs and with no performance loss compared to Windows 7.
FarCry 2 (DX9 / DX10):
Runs perfectly in DX9, but sometimes mouse stops working in DX10 mode, even in Vista compatibility mode.
