OMFG! Just installed the Omega Plutonium 1102 Driver's for the Radeon.

[jamautosound]

Get 'em here.

They cleared up all my issues with GTA III. Game isn't choppy, it doesn't slow down AT ALL, zero artifacts.

I know some people don't have any issues with the game, but if you do, and you have a Radeon, get these drivers. Good Stuff.