Mine

Section "ServerLayout"
    Identifier     "Default Layout"
    Screen      0  "Screen0" 0 0
    Screen      1  "Screen1" RightOf "Screen0"
    InputDevice    "Keyboard0" "CoreKeyboard"
EndSection

Section "Files"
    ModulePath      "/usr/lib/xorg/modules/extensions/nvidia"
    ModulePath      "/usr/lib/xorg/modules"
EndSection

Section "Module"
        Load  "extmod"
        Load  "dbe"
        Load  "record"
        Load  "xtrap"
        Load  "glx"
        Load  "type1"
        Load  "freetype"
EndSection

Section "ServerFlags"
    Option         "Xinerama" "0"
EndSection

Section "InputDevice"
    Identifier     "Keyboard0"
    Driver         "kbd"
    Option         "XkbModel" "pc105"
    Option         "XkbLayout" "us"
EndSection

Section "Monitor"
    Identifier     "Monitor0"
    VendorName     "Unknown"
    ModelName      "Acer AL1703"
    HorizSync       30.0 - 82.0
    VertRefresh     50.0 - 75.0
EndSection

Section "Monitor"
    Identifier     "Monitor1"
    VendorName     "Unknown"
    ModelName      "PANASONIC-CTV"
    HorizSync       15.0 - 34.0
    VertRefresh     59.0 - 61.0
EndSection

Section "Device"
    Identifier     "Videocard0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "GeForce FX 5500"
    BusID          "PCI:1:0:0"
    Screen          0
EndSection

Section "Device"
    Identifier     "Videocard1"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "GeForce FX 5500"
    BusID          "PCI:1:0:0"
    Screen          1
EndSection

Section "Screen"
    Identifier     "Screen0"
    Device         "Videocard0"
    Monitor        "Monitor0"
    DefaultDepth    24
#    Option         "TwinView" "0"
#    Option         "metamodes" "CRT: nvidia-auto-select +0+0"
    SubSection     "Display"
        Depth       24
        Modes      "1600x1200" "1280x1024" "1024x768" "800x600" "640x480"
    EndSubSection
EndSection

Section "Screen"
    Identifier     "Screen1"
    Device         "Videocard1"
    Monitor        "Monitor1"
    DefaultDepth    24
        Option  "UseDisplayDevice"      "DFP"
        Option  "NoLogo"                "TRUE"
        Option  "DPI"                   "100 x 100"
        Option  "ModeValidation"        "DFP-0: AllowNon60HzDFPModes"
        Option  "XvmcUsesTextures"      "FALSE"
#        Modeline "1280x720p@50" 59.42 1280 1312 1536 1568 720 735 741 757 +hsync +vsync
EndSection