Basically only needed for the new Vision A-Series Apu's:
'AMD released a new Catalyst hotfix driver update, 11.6b. This release comes 15 days after the month's main version, 11.6 WHQL, was released. The updated driver otherwise has the same exact feature-set as 11.6 WHQL, but adds support for graphics processors embedded into AMD's new Vision A-Series accelerated processing units, namely Radeon HD 6550D inside A8-3800 series, and Radeon HD 6530D inside A6-3600 series. Available for Windows XP, and Windows 7/Vista in both x86 and x86-64 forms'
http://support.amd.com/us/kbarticles/Pages/AMDCatalyst116aHotfix.aspx
'AMD released a new Catalyst hotfix driver update, 11.6b. This release comes 15 days after the month's main version, 11.6 WHQL, was released. The updated driver otherwise has the same exact feature-set as 11.6 WHQL, but adds support for graphics processors embedded into AMD's new Vision A-Series accelerated processing units, namely Radeon HD 6550D inside A8-3800 series, and Radeon HD 6530D inside A6-3600 series. Available for Windows XP, and Windows 7/Vista in both x86 and x86-64 forms'
http://support.amd.com/us/kbarticles/Pages/AMDCatalyst116aHotfix.aspx