Quake 4 Artifacts

[VRXJudge]

When I play SP on my X1800XL (latest official drivers - 5.13), I get artifacts and garbled parts of the screen after a short period. However, this does not happen on MP (which I think is somewhat more demanding). It does not occur when I fire up America's Army, either. Help?

edit: It didn't get artifacts in 3DMark05, either. I'm guessing it's a driver problem.

 

[Db2012]

is your card over clocked if so turn the settings down a bit. how is cooling?

 

[VRXJudge]

I switched to some Omega Drivers and it still happens, although to a lesser extent. I think I'll pick up a slot cooler to go in under my GPU. Strange how it doesn't glitch when running more demanding programs like 3DMark05, though.