Quote Originally Posted by Almindor
Mayhap, but try running Halflife(1) with Direct3D. You get 1/10 the performance of Direct3D. Perhaps it's some implementation problem but with the professionalizm of that team I doubt that.
Where have you took these numbers? Take for example above mentioned UT2003 where is almost no difference running either 3D API. Performance in this case is more dependant on driver quality / optimizations in it.