I got a Radeon X1900XT and some of my games like to stutter every 3 seconds. Doom 3, Quake 4, Half Life 2: Lost Coast, and Pacific Fighters like to stutter alot. I have the 6.3 drivers installed and I use the Catalyst Control Center. I previously had a 7800GT and didn't have these issues with it. I uninstalled the nvidia drivers and used driver cleaner and ran it on the nvidia WDM drivers 5 times at least to make sure the nvidia drivers were out. I installed the .NET 1.1 drivers first(which was required), and tonight, I installed the NET 2.0 drivers and that didn't help. I have been searching and tweaking stuff and have had no luck. Any help with this would be really appreciated.