what can DX 10 do that DX 9 cant?

I just can't see MS holding off on no DX10 support for windows XP. I mean that screws over the Developers, and they typically don't like being screwed over.

I am wanting to say that eventually when DX10 comes into full effect they will release for XP, but they are holding off till the last minute to get people to jump ship and buy an upgrade.

The only games I really want are Starcraft 2, Fallout 3, everything else looks like a clone of what is already out.
 
what prevents DX9 from doing what DX 10 does?
The API is coded differently, and DX10 cards have different features that none of the other ones had. I wouldnt expect to see a huge difference between the two anytime soon however.
 
DX 10 will be harder to play than DX9 right? you need better hardware in order to play the games at a smooth consistency of frame rates right?
 
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