installa questi che vanno molto meglio per amd bios mod: http://support.amd.com/en-us/kb-articles/Pages/Radeon-Software-Crimson-ReLive-Edition-Beta-for-Blockchain-Compute-Release-Notes.aspx

disinstalla prima i driver con questo: http://www.guru3d.com/files-details/display-driver-uninstaller-download.html