From extensive reading, the 6800 line (either card, they're the same thing with different clock speeds) did better than the X800XT (the Ultra) or at least matched it (the GT). The X800 Pro doesn't even come close, as it has 12 pipelines, whereas both of Nvidia's cards have 16. The Ultra is just clocked faster, and you pay $100 more for that.
Plus, ATI's cards can't use Shader Model 3.0.
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