Section "Monitor"

    Identifier  "My Monitor"
    HorizSync   30-61
    VertRefresh 50-120
    Modeline "1024x768_65.00"  69.71  1024 1080 1184 1344  768 769 772 798  -HSync +Vsync
    Modeline "1024x768_75.00"  81.80  1024 1080 1192 1360  768 769 772 802  -HSync +Vsync

EndSection

Section "Screen"
    Identifier  "Screen 1"
    Device      "* Generic VESA compatible"
    Monitor     "My Monitor"
    DefaultDepth 24

    Subsection "Display"
        Depth       24
        Modes       "1024x768_75.00"
        ViewPort    0 0
    EndSubsection
EndSection