According to the changelog, this driver should perform better in Windows 7 than Windows Vista. This is good news for Microsoft, it looks like hardware makers aren't making the same mistake as with Vista.
Changelog:
Using ATI Stream™ technology, owners of the ATI Radeon™ HD 4000 Series, ATI Radeon™ HD 3000 Series, and ATI Radeon™ HD 2000 Series of graphics accelerators will see a performance boost in their Folding@Home scores when running the latest Folding@Home client and upcoming cores in conjunction with ATI Catalyst™ 9.3
New AMD Display Library (ADL) SDK
As of ATI Catalyst 9.3 the Windows Vista HDMI audio driver is automatically included in the ATI Catalyst 9.3 package The HDMI audio driver will only be installed if the AMD graphics accelerator has an HDMI display connector and there is no 3rd party HDMI audio driver installed
Catalyst™ 9.3 brings performance benefits in several cases where framerates are CPU-limited. Some measured examples are:Lost Planet: Colonies gains up to 20% on 4800 series products, and up to 50% on 4600, 4500 and 4300 series products