Note that a 600Mhz PPC G3 and ATI Radeon 9100 (or even SIS Xabre) should have enough 3D power to blow away the Nintendo’s Game Cube out of the water.
plz note that any game console is tuned for games.
PPC/PC's are not. Just look at the X-Box. A GeForce 2 MX with a very serious attitude. Definitely not what I got out of my PC version. :-D