AMD released a hotfix for the Radeon HD 4870 and HD 4850 series of graphics cards. According to the company, this Hotfix improves overall performance and stability. It includes the Display Driver and Catalyst Control Center.

To download the Hotfix Driver, click on the links below:

Radeon HD 4800 Series Hotfix for Windows XP (32-bit and 64-bit included)
Radeon HD 4800 Series Hotfix for Windows Vista (32-bit and 64-bit included)

Note that this driver has not completed full AMD testing, and is only recommended for users experiencing the particular issue described above.