And I don't know what's going on in your head. NO DX10 IN XP! And, you can force all the DX10 effects in Crysis to be rendered with DX9, at a very small performance decrease. (I've done it!)
And why the hell do people compare clock speeds anymore! They mean nothing now!
I meant forced, should have specified.
Anyway when dealing with AMD processors and Video Cards, clock speeds make a huge difference.