vs. 
R600XTX or the faster iteration of Radeon HD 2900 series clocked at 800 MHz core and 2200 MHz GDDR4 memory will score 13.500+ in 3Dmark06 default settings. You will achieve this from QX6800 quad core and 8.36 drivers.
Geforce 8800 Ultra (at 650 – 2160 MHz memory will score
about 500 faster or about 14.000 marks. It would not with the old driver but
with Forceware 158.19 it scores much better in this test.
The ATI's final driver the one that fixes the Audio bit
should make Radeon HD 2900 XTX to perform at the same level as G80 Ultra. Not all
hopes are lost. Our reader reminded us that we claimed before that Radeon HD 2900 XTX performs slower than the XT card and we have to say that these tests where done with the latest revision of the 1 GB card and therefore the scores are now much better.