插槽图片
PCI Express，简称PCI-E，官方简称PCIe，是计算机总线的一个重要分支, 插槽图片如下：
引脚定义
下表列出在边缘连接器上的PCI Express卡两侧的导线。在印刷电路板（PCB）的焊接侧为A侧，并且组件侧的B侧。PRSNT1# 和PRSNT2# 引脚必须比其余稍短，以确保热插入卡完全插入。该WAKE# 引脚采用全电压唤醒计算机，但必须拉高从备用电源，以表明该卡是能够唤醒
| 引脚 | B侧 | A侧 | 描述 | 引脚 | B侧 | A侧 | 描述 | |
|---|---|---|---|---|---|---|---|---|
| 1 | +12 V | PRSNT1# | 必须连接到最远PRSNT2# 引脚 | 50 | HSOp (8) | Reserved | 通道8传输数据，+和− | |
| 2 | +12 V | +12 V | 51 | HSOn (8) | Ground | |||
| 3 | +12 V | +12 V | 52 | Ground | HSIp (8) | 通道8接收数据，+和− | ||
| 4 | Ground | Ground | 53 | Ground | HSIn (8) | |||
| 5 | SMCLK | TCK | SMBus和JTAG端口引脚 | 54 | HSOp (9) | Ground | 通道9传输数据，+和− | |
| 6 | SMDAT | TDI | 55 | HSOn (9) | Ground | |||
| 7 | Ground | TDO | 56 | Ground | HSIp (9) | 通道9接收数据，+和− | ||
| 8 | +3.3 V | TMS | 57 | Ground | HSIn (9) | |||
| 9 | TRST# | +3.3 V | 58 | HSOp (10) | Ground | 通道10传输数据，+和− | ||
| 10 | +3.3 V aux | +3.3 V | 备用电源 | 59 | HSOn (10) | Ground | ||
| 11 | WAKE# | PERST# | 链接激活；基本复位 | 60 | Ground | HSIp (10) | 通道10接收数据，+和− | |
| Key notch | 61 | Ground | HSIn (10) | |||||
| 12 | CLKREQ# | Ground | 要求运行的时钟 | 62 | HSOp (11) | Ground | 通道11传输数据，+和− | |
| 13 | Ground | REFCLK+ | 参考时钟差分对 | 63 | HSOn (11) | Ground | ||
| 14 | HSOp (0) | REFCLK− | 64 | Ground | HSIp (11) | 通道11接收数据，+和− | ||
| 15 | HSOn (0) | Ground | 65 | Ground | HSIn (11) | |||
| 16 | Ground | HSIp (0) | 通道0接收数据，+和− | 66 | HSOp (12) | Ground | 通道12传输数据，+和− | |
| 17 | PRSNT2# | HSIn (0) | 67 | HSOn (12) | Ground | |||
| 18 | Ground | Ground | 68 | Ground | HSIp (12) | 通道12接收数据，+和− | ||
| PCI Express ×1卡于引脚18结束 | 69 | Ground | HSIn (12) | |||||
| 19 | HSOp (1) | Reserved | 通道1传输数据，+和− | 70 | HSOp (13) | Ground | 通道13传输数据，+和− | |
| 20 | HSOn (1) | Ground | 71 | HSOn (13) | Ground | |||
| 21 | Ground | HSIp (1) | 通道1接收数据，+和− | 72 | Ground | HSIp (13) | 通道13接收数据，+和− | |
| 22 | Ground | HSIn (1) | 73 | Ground | HSIn (13) | |||
| 23 | HSOp (2) | Ground | 通道2传输数据，+和− | 74 | HSOp (14) | Ground | 通道14传输数据，+和− | |
| 24 | HSOn (2) | Ground | 75 | HSOn (14) | Ground | |||
| 25 | Ground | HSIp (2) | 通道2接收数据，+和− | 76 | Ground | HSIp (14) | 通道14接收数据，+和− | |
| 26 | Ground | HSIn (2) | 77 | Ground | HSIn (14) | |||
| 27 | HSOp (3) | Ground | 通道3传输数据，+和− | 78 | HSOp (15) | Ground | 通道15传输数据，+和− | |
| 28 | HSOn (3) | Ground | 79 | HSOn (15) | Ground | |||
| 29 | Ground | HSIp (3) | 通道3接收数据，+和− | 80 | Ground | HSIp (15) | 通道15接收数据，+和− | |
| 30 | Reserved | HSIn (3) | 81 | PRSNT2# | HSIn (15) | |||
| 31 | PRSNT2# | Ground | 82 | Reserved | Ground | |||
| 32 | Ground | Reserved | ||||||
| PCI Express ×4卡于引脚32结束 | ||||||||
| 33 | HSOp (4) | Reserved | 通道4传输数据，+和− | |||||
| 34 | HSOn (4) | Ground | ||||||
| 35 | Ground | HSIp (4) | 通道4接收数据，+和− | |||||
| 36 | Ground | HSIn (4) | ||||||
| 37 | HSOp (5) | Ground | 通道5传输数据，+和− | |||||
| 38 | HSOn (5) | Ground | ||||||
| 39 | Ground | HSIp (5) | 通道5接收数据，+和− | |||||
| 40 | Ground | HSIn (5) | ||||||
| 41 | HSOp (6) | Ground | 通道6传输数据，+和− | |||||
| 42 | HSOn (6) | Ground | ||||||
| 43 | Ground | HSIp (6) | 通道6接收数据，+和− | 图例 | ||||
| 44 | Ground | HSIn (6) | 接地引脚 | 零电压基准 | ||||
| 45 | HSOp (7) | Ground | 通道7传输数据，+和− | 电源引脚 | 为PCIe卡供电 | |||
| 46 | HSOn (7) | Ground | 输出引脚 | 从PCIe卡到主板的信号 | ||||
| 47 | Ground | HSIp (7) | 通道7接收数据，+和− | 输入引脚 | 从主板到PCIe卡的信号 | |||
| 48 | PRSNT2# | HSIn (7) | 漏极开路 | 可拉至低电平或感应到多个卡 | ||||
| 49 | Ground | Ground | 检测引脚 | 卡连接在一起 | ||||
| PCI Express ×8卡于引脚49结束 | 备用 | 目前没有使用，不连接 | ||||||