PCI-E 1x, 4x, 8x, 16x 接口定义
1. PCI-E插槽及金手指实物图
PCI-E插槽，从上至下依次为PCI-E 4X、PCI-E 16X、PCI-E 1X。
PCI-E 1X金手指：
PCI-E 4X金手指：
PCI-E 16X金手指：
2. PCI-E接口定义
说明：
| Ground pin | Zero volt reference | ||
| Power pin | Supplies power to the PCIe card | ||
| Card-to-host pin | Signal from the card to the motherboard | ||
| Host-to-card pin | Signal from the motherboard to the card | ||
| Open drain | May be pulled low or sensed by multiple cards | ||
| Sense pin | Tied together on card | ||
| Reserved | Not presently used, do not connect | ||
PCI-E管脚定义：
| PCI-Express Connector Pin-Out | ||||
| 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 |
| 14 | HSOp(0) | Transmitter Lane 0, | REFCLK- | Differential pair |
| 15 | HSOn(0) | Differential pair | GND | Ground |
| 16 | GND | Ground | HSIp(0) | Receiver Lane 0, |
| 17 | PRSNT#2 | Hotplug detect | HSIn(0) | Differential pair |
| 18 | GND | Ground | GND | Ground |
| End of the 1X connector | ||||
| 19 | HSOp(1) | Transmitter Lane 1, | RSVD | Reserved |
| 20 | HSOn(1) | Differential pair | GND | Ground |
| 21 | GND | Ground | HSIp(1) | Receiver Lane 1, |
| 22 | GND | Ground | HSIn(1) | Differential pair |
| 23 | HSOp(2) | Transmitter Lane 2, | GND | Ground |
| 24 | HSOn(2) | Differential pair | GND | Ground |
| 25 | GND | Ground | HSIp(2) | Receiver Lane 2, |
| 26 | GND | Ground | HSIn(2) | Differential pair |
| 27 | HSOp(3) | Transmitter Lane 3, | GND | Ground |
| 28 | HSOn(3) | Differential pair | GND | Ground |
| 29 | GND | Ground | HSIp(3) | Receiver Lane 3, |
| 30 | RSVD | Reserved | HSIn(3) | Differential pair |
| 31 | PRSNT#2 | Hot plug detect | GND | Ground |
| 32 | GND | Ground | RSVD | Reserved |
| End of the 4X connector | ||||
| 33 | HSOp(4) | Transmitter Lane 4, | RSVD | Reserved |
| 34 | HSOn(4) | Differential pair | GND | Ground |
| 35 | GND | Ground | HSIp(4) | Receiver Lane 4, |
| 36 | GND | Ground | HSIn(4) | Differential pair |
| 37 | HSOp(5) | Transmitter Lane 5, | GND | Ground |
| 38 | HSOn(5) | Differential pair | GND | Ground |
| 39 | GND | Ground | HSIp(5) | Receiver Lane 5, |
| 40 | GND | Ground | HSIn(5) | Differential pair |
| 41 | HSOp(6) | Transmitter Lane 6, | GND | Ground |
| 42 | HSOn(6) | Differential pair | GND | Ground |
| 43 | GND | Ground | HSIp(6) | Receiver Lane 6, |
| 44 | GND | Ground | HSIn(6) | Differential pair |
| 45 | HSOp(7) | Transmitter Lane 7, | GND | Ground |
| 46 | HSOn(7) | Differential pair | GND | Ground |
| 47 | GND | Ground | HSIp(7) | Receiver Lane 7, |
| 48 | PRSNT#2 | Hot plug detect | HSIn(7) | Differential pair |
| 49 | GND | Ground | GND | Ground |
| End of the 8X connector | ||||
| 50 | HSOp(8) | Transmitter Lane 8, | RSVD | Reserved |
| 51 | HSOn(8) | Differential pair | GND | Ground |
| 52 | GND | Ground | HSIp(8) | Receiver Lane 8, |
| 53 | GND | Ground | HSIn(8) | Differential pair |
| 54 | HSOp(9) | Transmitter Lane 9, | GND | Ground |
| 55 | HSOn(9) | Differential pair | GND | Ground |
| 56 | GND | Ground | HSIp(9) | Receiver Lane 9, |
| 57 | GND | Ground | HSIn(9) | Differential pair |
| 58 | HSOp(10) | Transmitter Lane 10, | GND | Ground |
| 59 | HSOn(10) | Differential pair | GND | Ground |
| 60 | GND | Ground | HSIp(10) | Receiver Lane 10, |
| 61 | GND | Ground | HSIn(10) | Differential pair |
| 62 | HSOp(11) | Transmitter Lane 11, | GND | Ground |
| 63 | HSOn(11) | Differential pair | GND | Ground |
| 64 | GND | Ground | HSIp(11) | Receiver Lane 11, |
| 65 | GND | Ground | HSIn(11) | Differential pair |
| 66 | HSOp(12) | Transmitter Lane 12, | GND | Ground |
| 67 | HSOn(12) | Differential pair | GND | Ground |
| 68 | GND | Ground | HSIp(12) | Receiver Lane 12, |
| 69 | GND | Ground | HSIn(12) | Differential pair |
| 70 | HSOp(13) | Transmitter Lane 13, | GND | Ground |
| 71 | HSOn(13) | Differential pair | GND | Ground |
| 72 | GND | Ground | HSIp(13) | Receiver Lane 13, |
| 73 | GND | Ground | HSIn(13) | Differential pair |
| 74 | HSOp(14) | Transmitter Lane 14, | GND | Ground |
| 75 | HSOn(14) | Differential pair | GND | Ground |
| 76 | GND | Ground | HSIp(14) | Receiver Lane 14, |
| 77 | GND | Ground | HSIn(14) | Differential pair |
| 78 | HSOp(15) | Transmitter Lane 15, | GND | Ground |
| 79 | HSOn(15) | Differential pair | GND | Ground |
| 80 | GND | Ground | HSIp(15) | Receiver Lane 15, |
| 81 | PRSNT#2 | Hot plug present detect | HSIn(15) | Differential pair |
| 82 | RSVD#2 | Hot Plug Detect | GND | Ground |
| End of the 16X connector | ||||
3. PCI-E传输速率
| PCI-E X1 | 8bit | 2.5GHz | 512Mb/s(双工) |
| PCI-E X4 | 8bit | 2.5GHz | 2Gb/s(双工) |
| PCI-E X8 | 8bit | 2.5GHz | 4Gb/s(双工) |
| PCI-E X16 | 8bit | 2.5GHz | 8Gb/s(双工) |
4. 参考
（1）PCI Express 1x, 4x, 8x, 16x bus pinout
http://pinouts.ru/Slots/pci_express_pinout.shtml
（2）PCI Express
http://en.wikipedia.org/wiki/PCI_Express
（3）PCI、PCI-x，PCI-E兼容以及他们之间的区别详细图解
http://www.jb51.net/hardware/xianka/56902.html