xorg.conf - 3 displays

Section "ServerLayout"
    Identifier     "Layout0"
    Screen      0  "Screen0" 0 0
    Screen      1   "Screen1" LeftOf "Screen0"
    Screen      2   "Screen2" RightOf "Screen0"
    Option      "Xinerama" "1"
EndSection

Section "Files"
    ModulePath   "/usr/lib/xorg/modules"
    FontPath     "/usr/share/fonts/corefonts"
    FontPath     "/usr/share/fonts/ttf-bitstream-vera"
    FontPath     "/usr/share/fonts/misc/"
    FontPath     "/usr/share/fonts/TTF/"
    FontPath     "/usr/share/fonts/OTF"
    FontPath     "/usr/share/fonts/Type1/"
    FontPath     "/usr/share/fonts/100dpi/"
    FontPath     "/usr/share/fonts/75dpi/"
    FontPath     "/usr/share/fonts/terminus"
    FontPath     "/usr/share/fonts/lfpfonts-fix"
    FontPath     "/usr/share/fonts/urw-fonts"
    FontPath     "/usr/share/fonts/unifont"
    FontPath     "/usr/share/fonts/dejavu"
    FontPath     "/usr/share/fonts/sharefonts"
    FontPath     "/usr/share/fonts/freefonts"
EndSection

Section "Module"
    Load  "extmod"
    Load  "glx"
    Load  "GLcore"
    Load  "record"
EndSection

Section "Monitor"
    Identifier   "Monitor0"
    VendorName   "Samsung"
    ModelName    "SA850"
    HorizSync       30.0 - 90.0
    VertRefresh     56.0 - 75.0
    Option         "DPMS"
EndSection

Section "Monitor"
    Identifier   "Monitor1"
    VendorName   "Samsung"
    ModelName    "245BW"
    HorizSync       30.0 - 81.0
    VertRefresh     56.0 - 75.0
    Option         "DPMS"
EndSection

Section "Monitor"
    Identifier   "Monitor2"
    VendorName   "Samsung"
    ModelName    "245BW"
    HorizSync       30.0 - 81.0
    VertRefresh     56.0 - 75.0
    Option         "DPMS"
EndSection

Section "Device"
    Identifier  "Card0"
    Driver      "nvidia"
    VendorName  "nVidia Corporation"
    BoardName   "Unknown Board"
    BusID       "PCI:3:0:0"
    Option      "NoLogo" "true"
    Option      "RenderAccel" "true"
EndSection

Section "Device"
    Identifier  "Card1"
    Driver      "nvidia"
    VendorName  "nVidia Corporation"
    BoardName   "Unknown Board"
    BusID       "PCI:4:0:0"
    Option      "NoLogo" "true"
    Option      "RenderAccel" "true"
    Screen      0
EndSection

Section "Device"
    Identifier  "Card2"
    Driver      "nvidia"
    VendorName  "nVidia Corporation"
    BoardName   "Unknown Board"
    BusID       "PCI:4:0:0"
    Option      "NoLogo" "true"
    Option      "RenderAccel" "true"
    Screen      1
EndSection

Section "Screen"
    Identifier "Screen0"
    Device     "Card0"
    Monitor    "Monitor0"
    DefaultDepth    24
    Option         "metamodes" "nvidia-auto-select +0+0"
    SubSection "Display"
        Modes     "2560x1440"
        Depth     24
    EndSubSection
EndSection

Section "Screen"
    Identifier     "Screen1"
    Device         "Card1"
    Monitor        "Monitor1"
    DefaultDepth    24
    Option         "TwinView" "0"
    Option         "TwinViewXineramaInfoOrder" "DFP-0"
    Option         "metamodes" "DFP-0: nvidia-auto-select +0+0"
    Option         "RandRotation" "On"
    Option         "Rotate" "CW"
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection

Section "Screen"
    Identifier     "Screen2"
    Device         "Card2"
    Monitor        "Monitor2"
    DefaultDepth    24
    Option         "TwinView" "0"
    Option         "metamodes" "DFP-2: nvidia-auto-select +0+0"
    Option         "RandRotation" "On"
    Option         "Rotate" "CCW"
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection