Well this may be old for some. If you want to try out the beta 4.9 driver for Doom 3 head on over to ati.
ATI is providing an early version of CATALYST 4.9 to users interested in increasing performance of Doom 3.
[COLOR=DarkRed]Warning : PLEASE READ ALL OF THIS BEFORE YOU PROCEED:[/COLOR]
The BETA display drivers found here are offered AS IS, without warranty of any kind, and have NOT been completely qualified by ATI. Usage of these drivers are without support of any kind, and you use them at your own risk.
ATI does NOT recommend installing these drivers in systems used for mission critical operations or where productivity of any kind is a concern.
Unless you are very comfortable with installing and un-installing drivers, we DO NOT recommend that you use the drivers provided here. These BETA Drivers are NOT SUPPORTED by ATI Customer Care or any other ATI department.