I just installed my new Radeon 5770 in place of my old 3870. When I set my resolution to 1920 by 1080, there will be an inch of my monitor that is not being used. It will not let me increase the hertz past 60 and still display the 1920 by 1080, If I increase the Hertz, it will set me to a lower resolution making my display very grainy. I did not have this problem with my 3870. I dont know what to do at this point any assistance would be greatly appreciated.