Hanners has put up a very good article comparing a X800 pro and a Geforce 6800GT running Counterstrike Source.
"We've been seeing a slew of benchmarks since the introduction of Valve's Stress Test as part of the CounterStrike: Source beta a few days ago. Well, now it's our turn to look at things here at Elite Bastards, so we've benchmarked both ATI and nVidia's more readily available boards - aka the Radeon X800 Pro and GeForce 6800GT - using this new test, as well as throwing some 6800 Ultra scores into the mix for good measure. We've tested using a host of different settings, as well as taken a look at the performance hit the two cards have with varying levels of anti-aliasing and anisotropic filtering enabled"
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Thanks to Joe for the email.
