DX10 will only be for Vista.
Vista will run DX9 games fine.......DX10 is backward compatible with DX9,8 or 7
XP will not run games with DX10 effects but will play the DX10 games using DX9 effects..
With a DX10 card, you can run DX9 games......but with a DX9 card, you can play a DX10 game but only with DX9 effects.....
ATI don't have their DX10 card yet, its roumored they have probs making the silicon with TSMC. They are due to release their new card in Jan and it sounds like it will be even faster than the 8800GTX
