/etc/X11/xorg.conf.d/10-monitor.conf for Dual monitor NVIDIA driver setup. Screen1 is rotated and above screen0.

10-monitor.conf

# nvidia-settings: X configuration file generated by nvidia-settings
# nvidia-settings:  version 325.15  (buildmeister@swio-display-x64-rhel04-03)  Wed Jul 31 19:04:13 PDT 2013

Section "ServerLayout"
    Identifier     "Layout0"
    Screen      0  "Screen0" 0 1280
    Screen      1  "Screen1" 448 0
    InputDevice    "Keyboard0" "CoreKeyboard"
    InputDevice    "Mouse0" "CorePointer"
    Option         "Xinerama" "0"
EndSection

Section "Files"
EndSection

Section "InputDevice"
    # generated from default
    Identifier     "Mouse0"
    Driver         "mouse"
    Option         "Protocol" "auto"
    Option         "Device" "/dev/psaux"
    Option         "Emulate3Buttons" "no"
    Option         "ZAxisMapping" "4 5"
EndSection

Section "InputDevice"
    # generated from default
    Identifier     "Keyboard0"
    Driver         "kbd"
EndSection

Section "Monitor"
    # HorizSync source: edid, VertRefresh source: edid
    Identifier     "Monitor0"
    VendorName     "Unknown"
    ModelName      "BenQ GL2450H"
    HorizSync       30.0 - 83.0
    VertRefresh     50.0 - 76.0
    Option         "DPMS"
EndSection

Section "Monitor"
    # HorizSync source: edid, VertRefresh source: edid
    Identifier     "Monitor1"
    VendorName     "Unknown"
    ModelName      "Samsung 770 Analog"
    HorizSync       30.0 - 81.0
    VertRefresh     56.0 - 85.0
    Option         "DPMS"
EndSection

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "GeForce GTX 670"
    BusID          "PCI:1:0:0"
    Screen          0
EndSection

Section "Device"
    Identifier     "Device1"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "GeForce GTX 670"
    BusID          "PCI:1:0:0"
    Screen          1
EndSection

Section "Screen"
    Identifier     "Screen0"
    Device         "Device0"
    Monitor        "Monitor0"
    DefaultDepth    24
    Option         "Stereo" "0"
    Option         "nvidiaXineramaInfoOrder" "DFP-1"
    Option         "metamodes" "HDMI-0: 1920x1080_60 +0+0; HDMI-0: nvidia-auto-select +0+0"
    Option         "SLI" "Off"
    Option         "MultiGPU" "Off"
    Option         "BaseMosaic" "off"
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection

Section "Screen"
    Identifier     "Screen1"
    Device         "Device1"
    Monitor        "Monitor1"
    DefaultDepth    24
    Option         "Stereo" "0"
    Option         "nvidiaXineramaInfoOrder" "CRT-0"
    Option         "metamodes" "DVI-I-0: 1280x1024_75 +0+0 {rotation=right}; DVI-I-0: 1024x768 +0+0 {rotation=right}; DVI-I-0: 1024x768_75 +0+0 {rotation=right}; DVI-I-0: 1024x768_70 +0+0 {rotation=right}; DVI-I-0: 1024x768_60 +0+0 {rotation=right}; DVI-I-0: 832x624 +0+0 {rotation=right}; DVI-I-0: 800x600 +0+0 {rotation=right}; DVI-I-0: 800x600_75 +0+0 {rotation=right}; DVI-I-0: 800x600_72 +0+0 {rotation=right}; DVI-I-0: 800x600_60 +0+0 {rotation=right}; DVI-I-0: 800x600_56 +0+0 {rotation=right}; DVI-I-0: 720x400 +0+0 {rotation=right}; DVI-I-0: 700x525 +0+0 {rotation=right}; DVI-I-0: 700x525d60 +0+0 {rotation=right}; DVI-I-0: 640x480 +0+0 {rotation=right}; DVI-I-0: 640x480_75 +0+0 {rotation=right}; DVI-I-0: 640x480_73 +0+0 {rotation=right}; DVI-I-0: 640x480_72 +0+0 {rotation=right}; DVI-I-0: 640x480_60 +0+0 {rotation=right}; DVI-I-0: 640x480_60_0 +0+0 {rotation=right}"
    Option         "SLI" "Off"
    Option         "MultiGPU" "Off"
    Option         "BaseMosaic" "off"
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection