AMD has compiled a performance driver for Rage, you can download it over here. The company claims significant performance gains, but it's only for Radeon HD 5000/6000 cards and only for Windows 7, both 32 and 64-bit are supported.
AMD Catalyst Rage Performance Driver Features:
- Significant performance gains for single GPU configurations
- Compatible with AMD Radeon™ 6000 and AMD Radeon 5000 series of graphics products
Mind you, AMD packed the wrong files in the previous release. Install this new one!