Headless server with 4x NVIDIA GeForce allowing remote desktop on Display:0 and overclocking via nvidia-settings

xorg.conf

# Links
# - http://ubuntuforums.org/showthread.php?t=1832456
# - https://foldingforum.org/viewtopic.php?f=16&t=25075

Section "ServerLayout"
  Identifier     "Layout0"
  Screen      0  "Screen0" 0 0
  Screen      1  "Screen1" 1280 0
  Screen      2  "Screen2" 1280 0
  Screen      3  "Screen3" 1280 0
  Option         "Xinerama" "0"
EndSection

Section "Monitor"
  Identifier   "Monitor0"
  HorizSync    28.0-80.0
  VertRefresh  48.0-75.0
  # 1280x720 @ 60.00 Hz (GTF) hsync: 44.76 kHz; pclk: 74.48 MHz
  Modeline     "1280x720_60.00" 74.48 1280 1336 1472 1664 720 721 724 746 -HSync +Vsync
  Option       "DPI" "96 x 96"
  Option       "DPMS"
EndSection

Section "Monitor"
  Identifier   "Monitor1"
  VendorName   "Unknown"
  ModelName    "CRT-0"
  HorizSync    0.0 - 0.0
  VertRefresh  0.0
  Option       "DPMS"
EndSection

Section "Monitor"
  Identifier   "Monitor2"
  VendorName   "Unknown"
  ModelName    "CRT-0"
  HorizSync    0.0 - 0.0
  VertRefresh  0.0
  Option       "DPMS"
EndSection

Section "Monitor"
  Identifier   "Monitor3"
  VendorName   "Unknown"
  ModelName    "CRT-0"
  HorizSync    0.0 - 0.0
  VertRefresh  0.0
  Option       "DPMS"
EndSection

Section "Device"
  Identifier "Device0"
  Driver     "nvidia"
  VendorName "NVIDIA Corporation"
  BoardName  "GeForce GTX 980 Ti"
  BusID      "PCI:3:0:0"
  Option     "Coolbits" "12"
EndSection

Section "Device"
  Identifier "Device1"
  Driver     "nvidia"
  VendorName "NVIDIA Corporation"
  BoardName  "GeForce GTX 980 Ti"
  BusID      "PCI:4:0:0"
  Option     "Coolbits" "12"
EndSection

Section "Device"
  Identifier "Device2"
  Driver     "nvidia"
  VendorName "NVIDIA Corporation"
  BoardName  "GeForce GTX 980 Ti"
  BusID      "PCI:5:0:0"
  Option     "Coolbits" "12"
EndSection

Section "Device"
  Identifier "Device3"
  Driver     "nvidia"
  VendorName "NVIDIA Corporation"
  BoardName  "GeForce GTX 980 Ti"
  BusID      "PCI:6:0:0"
  Option     "Coolbits" "12"
EndSection

Section "Screen"
  Identifier   "Screen0"
  Device       "Device0"
  Monitor      "Monitor0"
  Option       "UseDisplayDevice" "none"
  DefaultDepth 24
  Option       "Coolbits" "12"
  Option       "Stereo" "0"
  Option       "metamodes" "nvidia-auto-select +0+0"
  SubSection   "Display"
    Virtual    1280 720
    Depth      24
  EndSubSection
EndSection

Section "Screen"
  Identifier   "Screen1"
  Device       "Device1"
  Monitor      "Monitor1"
  DefaultDepth 24
  Option       "ConnectedMonitor" "CRT"
  Option       "Coolbits" "12"
  Option       "Stereo" "0"
  Option       "nvidiaXineramaInfoOrder" "CRT-0"
  Option       "metamodes" "nvidia-auto-select +0+0"
  SubSection   "Display"
    Depth      24
  EndSubSection
EndSection

Section "Screen"
  Identifier   "Screen2"
  Device       "Device2"
  Monitor      "Monitor2"
  DefaultDepth 24
  Option       "ConnectedMonitor" "CRT"
  Option       "Coolbits" "12"
  Option       "Stereo" "0"
  Option       "nvidiaXineramaInfoOrder" "CRT-0"
  Option       "metamodes" "nvidia-auto-select +0+0"
  SubSection   "Display"
    Depth      24
  EndSubSection
EndSection

Section "Screen"
  Identifier   "Screen3"
  Device       "Device3"
  Monitor      "Monitor3"
  DefaultDepth 24
  Option       "ConnectedMonitor" "CRT"
  Option       "Coolbits" "12"
  Option       "Stereo" "0"
  Option       "nvidiaXineramaInfoOrder" "CRT-0"
  Option       "metamodes" "nvidia-auto-select +0+0"
  SubSection   "Display"
    Depth      24
  EndSubSection
EndSection