Taken from here http://www.theinquirer.net/default.aspx?article=40913
Written by the quite frankly un-journalistic and "bitter against the world, especially Microsoft and Sony" Charlie but it kind of makes a mockery of the people who swore blind that DX10 on Vista was 100% necessary and simply couldn't be done on XP, requiring some form of ******* DX9.5-esque method. Just a curious and interesting titbit of news is all...
Microsoft backpedals for Nvidia, you lose
By Charlie Demerjian: Wednesday 11 July 2007, 08:56
EVER WONDER WHY MS refuses to release DX10 for XP, forcing users to Linux, and barring that, Vista - also known as Me II? It is easy, there was a technical reason, but it shot that down when Nvidia couldn't cut it. Now it is simply arm twisting.
The original reason was that DX10 required graphics memory to be virtualisable, a laudable goal. You can see hints of it here and here among other places. This was a good thing, perhaps a really good thing, and Microsoft was clamping down on requirements with the usual subtlety of a convicted monopolist.
This would not work with XP, and that was fine and dandy. It was an honest technical reason why you could not backport DX10 to XP without a major rip and replace operation. Microsoft wasn't going to bend on this one at all.
Then something odd happened. Nvidia had about as much success implementing this required feature as it did with it Me II drivers, that is to say, none. It couldn't do it, but it was required for DX10. What's an arm twisting Vole to do? Backpedal obviously.
So, MS threw NV a life preserver and made GPU memory virtualisation completely optional. ATI, which had implemented a dandy memory virtualisation scheme got screwed, or at least got what everyone who partners with MS got. Oh wait, I said that.
In any case, in doing this, MS removed the only impediment to backporting DX10 to XP, it is now, and has been for quite a while, completely possible. MS is screwing its customers to force an upgrade and you are a pawn in their revenue generation scheme.
Sadly, I will admit that I did upgrade. I went from XP to Ubuntu and bought a Wii. Life could not be better now, gaming is fun again, and spyware is a distant memory. µ
Written by the quite frankly un-journalistic and "bitter against the world, especially Microsoft and Sony" Charlie but it kind of makes a mockery of the people who swore blind that DX10 on Vista was 100% necessary and simply couldn't be done on XP, requiring some form of ******* DX9.5-esque method. Just a curious and interesting titbit of news is all...

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