In AquaMark, which takes some tweaking to run on NVIDIA-cards with DetonatorXP-drivers, Radeon 8500 and 7500 are able to score well at 1600x1200x32, while the 1024x768x32-scores aren't quite as good.
I simply used Demo001 and was surprised that the fillrate-winner Radeon 8500 is actually falling behind GeForce3 Ti500. Radeon 8500 is clearly suffering from driver issues that slow it down.
The performance of both Radeon cards in this benchmark is clearly inferior and can only be explained with a serious driver issue. NVIDIA is having ATi for breakfast in this benchmark.
The same is unfortunately valid for Giants. The results of both Radeon cards are very disappointing.