PCI-Express 8x Connector Pin Out

The PCI-Express bus supports 1x, 2x, 4x, 8x [20Gbps], 12x, 16x, and 32x bus widths [transmit / receive pairs]. The PCI-Express [PCIe] 8x signal names and pinout are listed in the table below. The 8x wide PCI Express bus is not used on main-stream PC motherboards. Links to additional PCI Express pinout widths are listed after the table. Currently the 1x PCIe bus is being used to replace the PCI bus, and the 16x PCIe interface is replacing the AGP expansion slot. The pinout table listed here is defined in the standard.

PCI Express is the new serial bus addition to the PCI series of specifications. This is a serial bus which uses two low-voltage differential LVDS pairs, at 2.5Gb/s in each direction [one transmit pair, and one receive pair]. PCI Express uses 8B/10B encoding [each 8 bit byte is translated into a 10 bit character in order to equalize the numbers of 1's and 0's sent, and the encoded signal contains an embedded clock]. PCI Express supports 1x [2.5Gbps], 2x, 4x, 8x, 12x, 16x, and 32x bus widths [transmit / receive pairs]. The PCI-Express [PCIe] 1x signal names and pinout are listed above.

The differential pins [Lanes] listed in the pin out table above are LVDS which stands for: Low Voltage Differential Signaling. The Electrical layer of LVDS listed above is described on the LVDS bus page. The function of the JTAG pins listed above are described on the JTAG bus page. The function of the SMbus pins listed above are described on the SMbus page.

PCI-Express 1x Connector Pinout and 1x signal names.
PCI-Express 4x Connector Pinout and 4x signal names.
PCI-Express 16x Connector Pinout and 16x signal names.
Back to the main PCI-Express PCIe bus page.

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