PCI Express 1x, 4x, 8x, 16x bus pinout

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PCI Express is the new serial bus addition to the PCI series of specifications.

PCI Express as a high-bandwidth, low pin count, serial, interconnect technology. PCI Express architecture provides a high performance I/O infrastructure for Desktop Platforms with transfer rates starting at 2.5 Giga transfers per second over a x1 PCI Express lane for Gigabit Ethernet, TV Tuners, 1394a/b controllers, and general purpose I/O. PCI Express architecture provides a high performance graphics infrastructure for Desktop Platforms doubling the capability of existing AGP8x designs with transfer rates of 4.0 Gigabytes per second over a x16 PCI Express lane for graphics controllers. ExpressCard utilizing PCI Express interface, developed by the PCMCIA group for mobile computers. PCI Express Advanced Power Management features help to extend platform battery life and to enable users to work anywhere, without an AC power source.

The broad adoption of PCI Express in the mobile, enterprise and communication segments enables convergence through the re-use of a common interconnect technology.

PCI-E is a serial bus which uses two low-voltage differential LVDS pairs, at 2.5Gb/s in each direction [one transmit, and one receive pair]. PCI Express supports 1x [2.5Gbps], 2x, 4x, 8x, 12x, 16x, and 32x bus widths [transmit / receive pairs].

The differential pins [Lanes] listed in the pin out table above are LVDS which stands for: Low Voltage Differential Signaling.

PCI-Express 1x Connector Pin-Out

PCI-Express 4x Connector Pin-Out

PCI-Express 8x Connector Pin-Out

PCI-Express 16x Connector Pin-Out

PinSide B ConnectorSide A Connector#NameDescriptionNameDescription1+12v+12 volt powerPRSNT#1Hot plug presence detect2+12v+12 volt power+12v+12 volt power3RSVDReserved+12v+12 volt power4GNDGroundGNDGround5SMCLKSMBus clockJTAG2TCK6SMDATSMBus dataJTAG3TDI7GNDGroundJTAG4TDO8+3.3v+3.3 volt powerJTAG5TMS9JTAG1+TRST#+3.3v+3.3 volt power103.3Vaux3.3v volt power+3.3v+3.3 volt power11WAKE#Link ReactivationPWRGDPower GoodMechanical Key12RSVDReservedGNDGround13GNDGroundREFCLK+Reference Clock
Differential pair14HSOp(0)Transmitter Lane 0,
Differential pairREFCLK-15HSOn(0)GNDGround16GNDGroundHSIp(0)Receiver Lane 0,
Differential pair17PRSNT#2Hotplug detectHSIn(0)18GNDGroundGNDGround19HSOp(1)Transmitter Lane 1,
Differential pairRSVDReserved20HSOn(1)GNDGround21GNDGroundHSIp(1)Receiver Lane 1,
Differential pair22GNDGroundHSIn(1)23HSOp(2)Transmitter Lane 2,
Differential pairGNDGround24HSOn(2)GNDGround25GNDGroundHSIp(2)Receiver Lane 2,
Differential pair26GNDGroundHSIn(2)27HSOp(3)Transmitter Lane 3,
Differential pairGNDGround28HSOn(3)GNDGround29GNDGroundHSIp(3)Receiver Lane 3,
Differential pair30RSVDReservedHSIn(3)31PRSNT#2Hot plug detectGNDGround32GNDGroundRSVDReserved33HSOp(4)Transmitter Lane 4,
Differential pairRSVDReserved34HSOn(4)GNDGround35GNDGroundHSIp(4)Receiver Lane 4,
Differential pair36GNDGroundHSIn(4)37HSOp(5)Transmitter Lane 5,
Differential pairGNDGround38HSOn(5)GNDGround39GNDGroundHSIp(5)Receiver Lane 5,
Differential pair40GNDGroundHSIn(5)41HSOp(6)Transmitter Lane 6,
Differential pairGNDGround42HSOn(6)GNDGround43GNDGroundHSIp(6)Receiver Lane 6,
Differential pair44GNDGroundHSIn(6)45HSOp(7)Transmitter Lane 7,
Differential pairGNDGround46HSOn(7)GNDGround47GNDGroundHSIp(7)Receiver Lane 7,
Differential pair48PRSNT#2Hot plug detectHSIn(7)49GNDGroundGNDGround50HSOp(8)Transmitter Lane 8,
Differential pairRSVDReserved51HSOn(8)GNDGround52GNDGroundHSIp(8)Receiver Lane 8,
Differential pair53GNDGroundHSIn(8)54HSOp(9)Transmitter Lane 9,
Differential pairGNDGround55HSOn(9)GNDGround56GNDGroundHSIp(9)Receiver Lane 9,
Differential pair57GNDGroundHSIn(9)58HSOp(10)Transmitter Lane 10,
Differential pairGNDGround59HSOn(10)GNDGround60GNDGroundHSIp(10)Receiver Lane 10,
Differential pair61GNDGroundHSIn(10)62HSOp(11)Transmitter Lane 11,
Differential pairGNDGround63HSOn(11)GNDGround64GNDGroundHSIp(11)Receiver Lane 11,
Differential pair65GNDGroundHSIn(11)66HSOp(12)Transmitter Lane 12,
Differential pairGNDGround67HSOn(12)GNDGround68GNDGroundHSIp(12)Receiver Lane 12,
Differential pair69GNDGroundHSIn(12)70HSOp(13)Transmitter Lane 13,
Differential pairGNDGround71HSOn(13)GNDGround72GNDGroundHSIp(13)Receiver Lane 13,
Differential pair73GNDGroundHSIn(13)74HSOp(14)Transmitter Lane 14,
Differential pairGNDGround75HSOn(14)GNDGround76GNDGroundHSIp(14)Receiver Lane 14,
Differential pair77GNDGroundHSIn(14)78HSOp(15)Transmitter Lane 15,
Differential pairGNDGround79HSOn(15)GNDGround80GNDGroundHSIp(15)Receiver Lane 15,
Differential pair81PRSNT#2Hot plug present detectHSIn(15)82RSVD#2Hot Plug DetectGNDGroundPRSNT#1 is connected to GND on motherboard.
Add on card needs to have PRSNT#1 connected to one of PRSNT#2 depending what type of connector is in use.