ATI is making a pre-release version of its upcoming CATALYST 4.9 driver available to its customers. This driver should result in better performance of Radeon Cards in Doom III.
ATI released a new - non WHQL - beta graphics driver to the public which is optimized for the new released game Doom III. We did not performance-test this driver yet.
"ATI is making a pre-release version of its upcoming CATALYST 4.9 driver available to its customers (in conjunction with the recent release of Doom 3). This pre-WHQL driver will deliver a great experience for RADEON customers playing Doom 3. The beta driver is intended to get Doom 3 performance enhancements into the hands of gamers as soon as possible. Testing and qualification of the driver will continue and the WHQL certified CATALYST 4.9 driver will be posted in September and will include additional features and functionality.
Beta drivers are not supported by ATI's technical support teams. For other games and applications or for customers requiring a supported driver, ATI recommends that customers continue to use the WHQL certified CATALYST 4.7 driver or the WHQL certified CATALYST 4.8 driver which will be available shortly from ATI.com."
The new Catalyst Doom3 beta driver is available here.