According to
Tom's Hardware Guide, the 6800 only pulls ahead in Doom3 if you set the resolution above 1024x768, which is more than reasonable...
As for other becnhmarks, the 6800 doesn't hold out against the Direct3D-specialized X800 at all, presuming you've turned on AA and Anisotropic filtering. However, I must say that the two are far more neck-and-neck than the 5950U and 9800XT ever were (where the 9800
Pro blew away the 5950U). Also, I'm still thinking that ATI perhaps has X900 up their sleeves... (I thought that ATI could do better than the X800XT)
Anyway, this is supposed to be a discussion of
inexpensive video cards, so let's try to stay on course.