http://www.cert.org/blogs/certcc/2012/06/amd_video_drivers_prevent_the.html
The interesting impact of this incompatibility is that Microsoft Windows systems that have an AMD or an ATI video chip cannot be secured as well as systems with video chips that have ASLR-compatible drivers. In other words, environments that require the utmost security against attacks should avoid AMD/ATI video cards until the drivers support system-wide ASLR.