Originally posted by Green Radience
And DX9 won't work with DX10 games at all.
I remember hearing this about DX8, when DX9 was coming out. I find that very hard to believe because it would be a very stupid move by the computer industry. I can see them restricting DX8 cards from working with DX10 made games, but not DX9. There are a lot of people who have spent a lot of money on DX9 cards, and are not going to be spending more money on a DX10 card.
If DX10 ends up not being backwards compatible, so be it. I'll have my new machine with DX10 video card by the time Vista is out anyway.