Why? Firaxis didn't use any. None that work, anyway.You'll need a device driver for that.
Btw, I have a friend in r/l that still can't use Crossfire in DX11 when running Civ5. Sad, when you find out that AMD/ATI is bragging that they helped develop the graphics rendering routines for Civ5. Pathetic, actually. It took a patch to make my $700 card work properly with the game. Hard to get into the game when you can't see it.