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The newest G4's have GeForce3's availble as a factory install option. Some info is as follows:
Heads-up to serious gamers
The most advanced graphics processor on the planet will be available for the Mac first. Apple has partnered with NVIDIA to bring you the next-generation 3D graphics processing unit (GPU) before anybody else gets their hands on it. An astonishing feat of engineering, the GeForce3 GPU has more than 57 million transistors, and will perform more than 800 billion operations per second ó and 76 billion floating point operations per second (FLOPS). Code-named the NV20, the NVIDIA GeForce3 GPU will be ready for action in the late March-early April timeframe. Itís yet another indication that Macintosh is surging ahead as the serious gamerís platform of choice.
Now I just need one for my PC.