Good commentary audiyoda... I agree it'll be interesting to revisit this comparison in 4-6 months when a couple of other shoes have dropped, like PCI-X among other things. The X800 is clocked as fast as it can reasonably go given the theoretical limitations of its fabrication process and the memory modules it's using, while the Nvidia solution has more headroom to grow - in fact, they've just sort of announced an Nvidia 6800 Ultra (extreme) variant to come out as well in the short term.

There are some questions how the NV part will fare on a PCI-X interface given their HSI bridge implementation, but it looks even more promising down the road. Whether ATI's offering has more legs for the long haul remains to be seen, but it's a winner out of the box for today's games.