A Motherboard (sometimes alternatively known as the mainboard, system board, planar board or logic board, or colloquially, a mobo) is the main printed circuit board (PCB) found in computers and other expandable systems. It holds and allows communication between many of the crucial electronic components. Here are complementary connectors of motherboards.

Forward to / Apple / Dell / ECS / HP / HPE pinouts or follow to 32 OLD hardware pinouts.
  •  Intel HD Audio analog front panel dongles can support up to two analog audio jacks, each of which signals user connection, or disconnection.
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  • Motherboard 3 pin CPU or Case Cooling fan connector 
  •  For 4-Wire Pulse Width Modulation (PWM) Controlled Fans
  • PC Speaker connector 
  •  RS232 serial is also called COM port
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  •  USB 3.0 is the successor of USB 2.0. USB 3 reduces the time required for data transmission, reduces power consumption, and is backward compatible with USB 2.0
  •  USB 3.0 contains normal USB 2.0 connections. This is commonly for PC cases that have ports that don't match the Available headers. Converting from 3.0 -> 2.0 is flawless, but converting from 2.0 -> 3.0 will make your 3.0 ports active, but will only function at 2.0 speeds.
  • USB header internal connector Used for card-edge bracket additinal USB ports and internal cardreaders. This is very old and does not match most modern mother board usb headers.

 Apple PCIe connector for BCM94360 Series WiFi Adapters
  •  Late model Apple laptops, iMacs and Mac Pros have analog speed control fans. This pinout and color scheme applies to fans made by Delta Electronics, models BFB0412HB (Apple P/N 603-5520), BFB0612H (Apple P/N 603-5519), BFB0812H (Apple P/N 603-6624), and others.
  •  Some Apple Mac Pros use a single 8 pin connector for two fans. Apple uses various color schemes for wires. This dual fan connector usually has all black wires.
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  • Dell Pinouts

    •  This is to fit a standard 4pin fan to a dell motherboard 5pin CPU (speed controlled) fan connector (essentially, you just swap pins 1 & 3 on the standard connector)
    •  20 Pin Front panel USB, Speaker (Optional MIC) Proprietary
    •  WARNING. Similar to Optiplex GX BUT +5v & Gnd differs !
    • DELL Dimension 9200 Fan Fan for CPU or HD
    • Dell GX270 SER2 motherboard connector 
    •  Dell Optiplex 360, 990, 7010, 9010 motherboard power switch connector
    •  Similar to Dell Dimension 3100 (no Mic) and 5150 (USB skts are counted from the left)
    •  For Dell Optiplex 745 SFF-Not tested on other Dell's models.
    •  Similar to other Dell I/O assembly boards, it is a board with USB connectors and a headphone connector. It also has a connection to the Control Panel Board (Power switch and LEDs).
    •  Dell Optiplex Internal Serial Port-3.3V Signaling
    • Dell PowerEdge 2300 internal USB connector 10 pin one row special USB connector
    •  12-way header with removable pins.

    ECS Pinouts

    •  Can be found on some new ECS motherboards

    HP Pinouts

    •  Proprietary 4 pin CPU Fan connector
    •  Proprietary 5 pin Fan connector
    •  Molex 10 Pin PSU AUX Connector
    •  Secondary COM port cable for the Hewlett Packard dc7900 series workstations.
    •  HP Microserver 12 FAN Pinout
    •  HP ML350 G6 Motherboard Fan Connector Pinout
    •  HP Server 5 pin Fan connector (DL580 G7)
    •  6-pin Panel This header accomodates several system panel functions

    HPE Pinouts

    •  Cable used to connect an extra bay on HPE Generation 8 servers (ML350p G8 for example). Cable part of cable kit 667266-001 containing Hard Drive Power Cable, short SAS cable and dual connectors graphics power cable.

     
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