Radeon Software Crimson ReLive Edition: an overview
 

The supposedly bumpy quality of Radeon graphics drivers has been conventional wisdom among PC enthusiasts for years. Discussions of graphics-card performance often include at least one vague remark like "yeah, but AMD drivers." It's a sore spot for fanboys, and it's an easy way to start a flamewar. Whether it's justified or not, that perception may have harmed the reputation of Radeons in recent memory for some.

http://techreport.com/review/31077/r...on-an-overview