XP 64 bit was always intended to be sold to Business users, not home users. To get a good idea of that, look for the Anitvirus available for it. Norton for example requires you to have the "Professional" version, their "Home" is 32 bit only.
And it is also the same with drivers. ATI and NVidia do not optimize the drivers in the same way as they do with the 32 bit versions. That is because the majority of users have it for Photoshop, CAD, and audio/video editing, not games. And there are very few games optimized for 64 bit OS. Far Cry is about the only one I can think of that is (and brags about the fact).
However, expect that to slowly start to change in the next year. With Vista comming in both 32 and 64 bit versions, more companies are sure to start optimizing code (and drivers) for 64 bit.
And this is not to unusual. Even though Win95 was 32 bit, it took many years to remove all of the 16 bit code from programs. As recently as 2 years ago, a lot of programs still used 16 bit instillation software.
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