Mine

Section "ServerLayout"

    Identifier     "Simple Layout"
    Screen         "Screen 1" 0 0
    InputDevice    "Mouse1" "CorePointer"
    InputDevice    "Keyboard1" "CoreKeyboard"
EndSection

Section "Files"

    FontPath        "/usr/local/lib/X11/fonts/misc/"
    FontPath        "/usr/local/lib/X11/fonts/TTF/"
    FontPath        "/usr/local/lib/X11/fonts/OTF"
    FontPath        "/usr/local/lib/X11/fonts/Type1/"
    FontPath        "/usr/local/lib/X11/fonts/100dpi/"
    FontPath        "/usr/local/lib/X11/fonts/75dpi/"
    FontPath        "/usr/local/lib/X11/fonts/local/"
EndSection

Section "Module"

    Load           "dbe"        # Double buffer extension
    SubSection     "extmod"
        Option         "omit xfree86-dga"   # don't initialise the DGA extension
    EndSubSection
    Load           "freetype"
    Load           "glx"
EndSection

Section "InputDevice"

    Identifier     "Keyboard1"
    Driver         "kbd"
    Option         "AutoRepeat" "500 30"
    Option         "XkbRules" "xorg"
    Option         "XkbModel" "dellusbmm"
    Option         "XkbLayout" "us"
EndSection

Section "InputDevice"

    Identifier     "Mouse1"
    Driver         "mouse"
    Option         "Protocol" "Auto"    # Auto detect
    Option         "Device" "/dev/sysmouse"
    Option         "ZAxisMapping" "4 5 6 7"
    Option         "Emulate3Buttons"
EndSection

Section "Monitor"

    Identifier     "Dell SE198WFP"
    HorizSync       31.0 - 83.0
    VertRefresh     60.0 - 75.0
EndSection

Section "Device"

    Identifier     "Standard VGA"
    Driver         "vga"
    VendorName     "Unknown"
    BoardName      "Unknown"
EndSection

Section "Device"

    #VideoRam    131072
    # Insert Clocks lines here if appropriate
    Identifier     "NVIDIA GeForce 8300"
    Driver         "nvidia"
EndSection

Section "Screen"
    Identifier     "Screen 1"
    Device         "NVIDIA GeForce 8300"
    Monitor        "Dell SE198WFP"
    DefaultDepth    24
    Option         "AddARGBGLXVisuals" "True"
    SubSection     "Display"
        Viewport    0 0
        Depth       24
        Modes      "1440x900"
    EndSubSection
EndSection