x1800 512mb eats 7800gtx for breakfast. The thing has better software, better stats, and is goign to pwn the 7800gtx even more when the next gen games come out that can take even more advantage of the new ati software.
check out www.anandtech.com
And the x1800 512mb ABOSOLUTLY DESTROYS The NVIDIA in any kind of 3dmarks/stats etc. because it has better software. Point made.