Demul 0.7 on a core 2 duo?

My current PC specs are c2d e8400, 4GB RAM and a 8800GT with a 26" 1360x768 display.

As the 8800GT is only DX10, I can't run the newest versions.

My question is, if I buy a second hand DX11 graphics card, am likely to be able to run the latest builds OK? Or is the core 2 duo just too slow?

Thanks!