AMD has released a new AMD Catalyst 12.1a preview driver

The AMD Catalyst 12.1a Preview driver includes all of the features found in AMD Catalyst 12.1 Preview.

Additional changes for upcoming update of Rage
Resolves some new texture corruption issues introduced by the latest version of the game
Improved performance ~5%
Smoother game play and reduces multicore sync points
Fixed mapbuffer failures when switching maps on 32-bit systems.
Fixed a game crash when switching maps back and forth on 32 and 64bit systems
Instructions:
Download and install the Driver from the following location:

AMD Catalyst 12.1a Preview driver for Windows vista & Windows 7
AMD Catalyst 12.1a Preview driver for Windows XP
For detailed instructions on how to install the drivers, please refer to:

Article GPU-33 for a Windows 7 based system
Article GPU-1 for a Windows Vista based system
Article GPU-2 for a Windows XP

Note! This Driver is provided “AS IS” in accordance with the End User License Agreement

Applicable Products:
This article applies to the following configuration(s):

Hardware:
AMD Radeon HD 6000 Series
AMD Radeon HD 5000 Series

Operating Systems:
Windows 7 32-bit Edition
Windows 7 64-bit Edition
Windows XP 32-bit Edition
Windows Vista 32-bit Edition
Windows Vista 64-bit edition

  AMD Catalyst 12.1a Preview Driver