I recently downloaded the June 2011 release of the UDK; and I recently found that my graphics card doesn't support DX11 (even though it's installed). So, the UDK will only ever run under DX9.
Via my research, I found that the UDK used to support DX10, but removed said feature-set for DX11; so now the only choices are DX9 or DX11.
Is there any possible way of forcing the June release of the UDK to run using DX10?
If not, can someone point me to the latest release of the UDK that had DX10 support.
Regardless, I understand that DX10 tends to give more realistic results, but at a performance cost. For a large, realistic FPS game, is using DX10 really better than using DX9?