"The Half-Life 2 stress test is really just a quick timedemo that runs through an E3 demo we saw in 2003. In the demo are many of the Source Engine's special effects, including bump-mapping, sub-divided surfaces and light blooming. I've also received a lot of email regarding NVIDIA's leaked 65.62 Forceware drivers, so I will be including benchmarks with those as well."
VR-Zone is one of the few websites that have posted comparison results, mostly important they test using the Half-Life 2 stress demo and not Counter-Strike's which uses less visual effects and does not give the complete picture on what performance to expect from the actual game. As was to be expected, ATI's X800 cards are on top with all NVIDIA 6800-boards following 10-15% behind in most tests, good news is that there's still time for some more drivers optimization and in general terms, all new-generation cards perform quite good.