Our USA friends at HardOCP showed us that at 16x12 High quality and 4X FSAA and 8X Anisotropic filtering 6800 Ultra gets almost two times faster then X800PRO and in all but one benchmark Nvidia dominates.
In 10x7 high quality no FSAA and AF ATI can keep up with Nvidia cards but that is the only time they can be as good as Nvidia or marginally slower.
This does not come as a surprise as NV30 can render 8x0 in Doom 3 if your rendering pass doesn't require Z-buffer or Color information and in many case Doom 3 doesn't need them or extraordinary 32x0 in Doom 3 with NV40 marchitecture.
If you want normal texture and pixel rendering passes, or should I say traditional, you will be limited to 4x2 with NV30, 35 and 38 generation or 16x1 with NV40 marchitecture just as ATI will have 8x1 with R3X0 cards or 16x1 with X800XT, R42X cards. As many of you know ATI can not do rendering passes without Z or Color and double its pipelines number as Nvidia can. It's all in the silicon and ATI didn't feel it necessary.
Doom 3 is the game where Nvidia will be faster while Half Life 2 is expected to run faster on ATI due to its special links with Valve, you'll be astonished to hear. ยต