No, your wrong. Only nVidia's 4XX serious can run DX11. Maybe it can run in "DX11" but without any DX11 features.
you can play any game out in dx9 dx10 or dx11.
Anyways, do you think the 5730 in the other laptop would be capable of running future DX11 games? Or would I be better of running DX11 games in DX10 mode on the 360?
Or even just running DX10 with the 5730, cause it should handle any DX10 game?