I have the Amd A10 5800k APU. my monitor native resolution is 1440*900p. i tried putting far cary 3 at 720p but it has letter box on the top and bottom of the screen. This doesn't happened with Battle Field 3
Have you tried setting the resolution of Far Cry 3 to 1440 x 900?
thats what i play on but i want get more fps by gaming at lower resolution