ok, the radeon does have opengl support I never said it didnt. It's support just isn't as good or well written as the GeForce opengl support. Using the standard benchmark for testing FPS in linux, glxgears, a radeon 9000 will give you about 1200 to 2000 while a GeForce4 users claim up to 12000. The nividia drivers are freely distributed but they are closed source. I suppose the radeon drivers will one day be comprable speed but not right now.

As for 64-bit processors maybe i was wrong. I really dont stay ontop of bleeding edge tecnology, but i was alway under the impression you need a 64-bit OS on a 64-bit processor...