Nope, if you have DX11 you're good to go. However, with older games you might run into some compatibility issues. A similar question has already been brought up here
. I'm running an ATI Radeon HD 4890, granted it's a DX10 card, I'm still able to play older games no problem like AoE2 and Rise of Nations. I even run Starcraft on it (with minor issues) but usually if theres a compatibility issue 9 times out of 10 someone has conjured up a fix for it.