Maybe this is a stupid question...so forgive me.

Will DX10 only work with Vista? Also, am I right in thinking that any video card on the market today will not be DX10 compatible?

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DX10 will initially be for Vista only, and there are no plans at least made public for it to be made for Windows XP or other prior generation operating systems.

Much the same as DX9, there is a difference between being compliant and compatible. The majority of cards available today will be compatible; that means they will work with DX10, just as a Geforce Ti4200 is compatible with DX9, although it isn't compliant. Compliant means that the graphics card fully supports all the effects and features DX10 can do. No one really knows at this point what the final feature set of DX10 will be; therefore, we don't know which cards out today will be compliant.

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DX10 will also not be backwards compatible with DX9 allegedly.

That's misleading.

Vista will have a DX9 layer in it. So on the surface, DX10 isn't compatible since it's totally rebuilt from the ground up and is fundamentally a different API, but Vista will have a DX9 component in it as well.

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