HardOCP has posted an article wherein they accuse ATI of writing drivers that are optimized for Quake 3, just Quake 3, and only Quake 3. Apparently, using a program called quackifier, which modifies the Quake3 executable by changing every "Quake" reference to "Quack" and then creating a new executable called "Quack3", they have demonstrated to some extent that the Quack3.exe benchmarks are around 15% slower than with the original Quake3.exe (same box, os, drivers, etc).
P.S: Radeon 8500 ownz j00!:mad::D