Quake 3
The game that lent its engine to so many others may not be the freshest, but that doesn't seem to diminish its popularity. Its game engine can be found in several modern games in refined, modified and tweaked versions that exploit its potential even more. Nonetheless, this OpenGL game is still THE standard benchmark in the hardware community to determine a 3D card's pure performance, since it scales very well with increasing rendering performance.
The Radeon 9700 PRO breaks the 300 fps mark in 1024x768 - at High Quality settings and with maximum texture quality, no less! The ATi card holds on to its clear lead throughout all tested resolutions.
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