PCI-Express 16x Connector Pin Out


The PCI-Express bus supports 1x [2.5Gbps], 2x, 4x, 8x, 12x, 16x, and 32x bus widths [transmit / receive pairs].
The PCI-Express [PCIe] 16x signal names and pinout are listed in the table below.
The 16x wide PCI Express bus is used as the video expansion slot on PC motherboards, replacing the older and slower AGP video slot.
The pinout table below provides 16 transmit pairs and 16 receive signal pairs [signals are differential] for a signal through-put of 5GBps.
Pinout tables for the other PCI Express widths are listed below the table.





PCI-Express 16x PinOut
Pin Side B Connector Side A Connector
# Name Description Name Description
1 +12v +12 volt power PRSNT#1 Hot plug presence detect
2 +12v +12 volt power +12v +12 volt power
3 +12v +12 volt power +12v +12 volt power
4 GND Ground GND Ground
5 SMCLK SMBus clock JTAG2 TCK
6 SMDAT SMBus data JTAG3 TDI
7 GND Ground JTAG4 TDO
8 +3.3v +3.3 volt power JTAG5 TMS
9 JTAG1 +TRST# +3.3v +3.3 volt power
10 3.3Vaux 3.3v volt power +3.3v +3.3 volt power
11 WAKE# Link Reactivation PWRGD Power Good
Mechanical Key
12 RSVD Reserved GND Ground
13 GND Ground REFCLK+ Reference Clock
Differential pair
14 HSOp(0) Transmitter Lane 0,
Differential pair
REFCLK-
15 HSOn(0) GND Ground
16 GND Ground HSIp(0) Receiver Lane 0,
Differential pair
17 PRSNT#2 Hotplug detect HSIn(0)
18 GND Ground GND Ground
19 HSOp(1) Transmitter Lane 1,
Differential pair
RSVD Reserved
20 HSOn(1) GND Ground
21 GND Ground HSIp(1) Receiver Lane 1,
Differential pair
22 GND Ground HSIn(1)
23 HSOp(2) Transmitter Lane 2,
Differential pair
GND Ground
24 HSOn(2) GND Ground
25 GND Ground HSIp(2) Receiver Lane 2,
Differential pair
26 GND Ground HSIn(2)
27 HSOp(3) Transmitter Lane 3,
Differential pair
GND Ground
28 HSOn(3) GND Ground
29 GND Ground HSIp(3) Receiver Lane 3,
Differential pair
30 RSVD Reserved HSIn(3)
31 PRSNT#2 Hot plug detect GND Ground
32 GND Ground RSVD Reserved
33 HSOp(4) Transmitter Lane 4,
Differential pair
RSVD Reserved
34 HSOn(4) GND Ground
35 GND Ground HSIp(4) Receiver Lane 4,
Differential pair
36 GND Ground HSIn(4)
37 HSOp(5) Transmitter Lane 5,
Differential pair
GND Ground
38 HSOn(5) GND Ground
39 GND Ground HSIp(5) Receiver Lane 5,
Differential pair
40 GND Ground HSIn(5)
41 HSOp(6) Transmitter Lane 6,
Differential pair
GND Ground
42 HSOn(6) GND Ground
43 GND Ground HSIp(6) Receiver Lane 6,
Differential pair
44 GND Ground HSIn(6)
45 HSOp(7) Transmitter Lane 7,
Differential pair
GND Ground
46 HSOn(7) GND Ground
47 GND Ground HSIp(7) Receiver Lane 7,
Differential pair
48 PRSNT#2 Hot plug detect HSIn(7)
49 GND Ground GND Ground
50 HSOp(8) Transmitter Lane 8,
Differential pair
RSVD Reserved
51 HSOn(8) GND Ground
52 GND Ground HSIp(8) Receiver Lane 8,
Differential pair
53 GND Ground HSIn(8)
54 HSOp(9) Transmitter Lane 9,
Differential pair
GND Ground
55 HSOn(9) GND Ground
56 GND Ground HSIp(9) Receiver Lane 9,
Differential pair
57 GND Ground HSIn(9)
58 HSOp(10) Transmitter Lane 10,
Differential pair
GND Ground
59 HSOn(10) GND Ground
60 GND Ground HSIp(10) Receiver Lane 10,
Differential pair
61 GND Ground HSIn(10)
62 HSOp(11) Transmitter Lane 11,
Differential pair
GND Ground
63 HSOn(11) GND Ground
64 GND Ground HSIp(11) Receiver Lane 11,
Differential pair
65 GND Ground HSIn(11)
66 HSOp(12) Transmitter Lane 12,
Differential pair
GND Ground
67 HSOn(12) GND Ground
68 GND Ground HSIp(12) Receiver Lane 12,
Differential pair
69 GND Ground HSIn(12)
70 HSOp(13) Transmitter Lane 13,
Differential pair
GND Ground
71 HSOn(13) GND Ground
72 GND Ground HSIp(13) Receiver Lane 13,
Differential pair
73 GND Ground HSIn(13)
74 HSOp(14) Transmitter Lane 14,
Differential pair
GND Ground
75 HSOn(14) GND Ground
76 GND Ground HSIp(14) Receiver Lane 14,
Differential pair
77 GND Ground HSIn(14)
78 HSOp(15) Transmitter Lane 15,
Differential pair
GND Ground
79 HSOn(15) GND Ground
80 GND Ground HSIp(15) Receiver Lane 15,
Differential pair
81 PRSNT#2 Hot plug present detect HSIn(15)
82 RSVD#2 Hot Plug Detect GND Ground




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, 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] 16x 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 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 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 8x Connector Pinout and 8x signal names.
The main PCI-Express bus [PCIe] page.

eH1 VIA 16x PCIexpress Graphics card
16x PCIe Graphics card




PC motherboard
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Modified 2/27/12
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