not sure if it been posted yet but AMD have issue new drivers for the HD57xx launch
http://support.amd.com/us/kbarticles/Pages/ATIRadeonHD5800seriesrecommendedgraphicsdriver.aspx
http://support.amd.com/us/kbarticles/Pages/ATIRadeonHD5800seriesrecommendedgraphicsdriver.aspx