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