Why dose X keep setting my resolution to the wrong one on boot

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http://askubuntu.com – I have set my xorg.conf to out put at 1080p 60hz but when I boot it always chooses 1080i 50hz and I do not know why. Can any one tell me if i am doing something wrong ? heres my xorg : nvidia-settings: X configuration file generated by nvidia-settings nvidia-settings: version 295.33 (buildd@zirconium) Fri Mar 30 13:38:49 UTC 2012 Section "ServerLayout" Identifier "Layout0" Screen 0 "Screen0" 0 0 InputDevice "Keyboard0" "CoreKeyboard" InputDevice "Mouse0" "CorePointer" Option "Xinerama" "0" EndSection Section "Files" EndSection Section "Input (HowTos)