If anyone claims that the GTX 260 supports DX11, they are flat out wrong. It doesn't even support DX10.1. The 260 is DX10 only.
There aren't that many DX11 games out there, but personally, Battlefield: Bad Company 2 is one of the games I play the most, and the lighting and shadow effects in DX11 mode are considerably better-looking than in DX10 or DX9 mode.
There aren't that many DX11 games out there, but personally, Battlefield: Bad Company 2 is one of the games I play the most, and the lighting and shadow effects in DX11 mode are considerably better-looking than in DX10 or DX9 mode.