[sixmil]

Choppy on my box as well:

Athlon XP 2200
Radeon 9200 128MB
512MB RAM
All the latest drivers

Carmack says you'll need a 512MB graphics card to handle full resolution, and those don't even exist yet. It'll be a cool game when hardware catches up next year. Kind of sad because I get up to 300 frames per second on Quake 3 at full resolution. I have to admit that the graphics and effects look pretty realistic though.

[gcruse]

Athlon XP 2200
Radeon 9200 128MB
512MB RAM
All the latest drivers

I just installed the Catalyst 8.03 upgraded drivers from ATI -- the choppiness is gone and the game play is smooth.
Medium resolution, recommended system options

Pentium 4 2.6GHZ
Radeon 9200 128MB
512MB RAM