We ran the Regulator demo set to Ultra quality for this test.
A few points of interest are the new X1800 cards. Comparing the 1800XL against the 850XT PE we see the older gen card is faster without AA on, but the XL slightly faster with AA enabled.
Looking at the 7800GTX and the 1800XT we see that these two are back and forth with the ATI card taking the lead at 1600×1200 with AA enabled. This is a big win against an overclocked GTX.