5770 not fullscreen in bootcamp

[ScrappyCoco]

hi im using a 5.1 mac pro with a 5770 through bootcamp and on my 720p television with a minidisplayport to hdmi adapter and cant seem to get full screen i have the thick black borders around the image

 

[pastrychef]

You may need to adjust the overscan.

 

[ActionableMango]

http://support.apple.com/kb/HT5841