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Connector pinout: PCI Express 16x PCI Express was introduced to overcome the limitations of the original PCI bus. Developed and released by Intel over a decade ago, the original PCI bus operated at 33MHz and 32 bits with a peak theoretical bandwidth of 132MB per second. It used a shared bus topology – bus bandwidth is shared among multiple devices - to enable communication among the different devices on the bus. PCI Express 1x - 164 pin Female Connector pin name direction description color 1B +12v +12 volt power 2 +12v +12 volt power 3 RSVD Reserved 4 GND Ground 5 SMCLK SMBus clock 6 SMDAT SMBus data 7 GND Ground 8 +3.3v +3.3 volt power 9 JTAG1 +TRST# 10 3.3Vaux 3.3v volt power 11 WAKE# Link Reactivation 12 RSVD Reserved 13 GND Ground 14 HSOp(0) Transmitter Lane 0, Differential pair 15 HSOn(0) 16 GND Ground 17 PRSNT#2 Hotplug detect 18 GND Ground 19 HSOp(1) Transmitter Lane 1, Differential pair 20 HSOn(1) 21 GND Ground 22 GND Ground 23 HSOp(2) Transmitter Lane 2, Differential pair 24 HSOn(2) 25 GND Ground 26 GND Ground 27 HSOp(3) Transmitter Lane 3, Differential pair 28 HSOn(0) 29 GND Ground 30 RSVD Reserved 31 PRSNT#2 Hot plug detect 32 GND Ground 33 HSOp(4) Transmitter Lane 4, Differential pair 34 HSOn(4) 35 GND Ground 36 GND Ground 37 HSOp(5) Transmitter Lane 5, Differential pair 38 HSOn(5) 39 GND Ground 40 GND Ground 41 HSOp(6) Transmitter Lane 6, Differential pair 42 HSOn(6) 43 GND Ground 44 GND Ground 45 HSOp(7) Transmitter Lane 7, Differential pair 46 HSOn(7) 47 GND Ground 48 PRSNT#2 Hot plug detect 49 GND Ground 50 HSOp(8) Transmitter Lane 8, Differential pair 51 HSOn(8) 52 GND Ground 53 GND Ground 54 HSOp(9) Transmitter Lane 9, Differential pair 55 HSOn(9) 56 GND Ground 57 GND Ground 58 HSOp(10) Transmitter Lane 10, Differential pair 59 HSOn(10) 60 GND Ground 61 GND Ground 62 HSOp(11) Transmitter Lane 11, Differential pair 63 HSOn(11) 64 GND Ground 65 GND Ground 66 HSOp(12) Transmitter Lane 12, Differential pair 67 HSOn(12) 68 GND Ground 69 GND Ground 70 HSOp(13) Transmitter Lane 13, Differential pair 71 HSOn(13) 72 GND Ground 73 GND Ground 74 HSOp(14) Transmitter Lane 14, Differential pair 75 HSOn(14) 76 GND Ground 77 GND Ground 78 HSOp(15) Transmitter Lane 15, Differential pair 79 HSOn(15) 80 GND Ground 81 PRSNT#2 Hot plug present detect 82 RSVD#2 Hot Plug Detect 1A PRSNT#1 Hot plug presence detect 2 +12v +12 volt power 3 +12v +12 volt power 4 GND Ground 5 JTAG2 TCK 6 JTAG3 TDI 7 JTAG4 TDO 8 JTAG5 TMS 9 +3.3v +3.3 volt power 10 +3.3v +3.3 volt power 11 PWRGD Power Good 12 GND Ground 13 REFCLK+ Reference Clock Differential pair 14 REFCLK- 15 GND Ground 16 HSIp(0) Receiver Lane 0, Differential pair 17 HSIn(0) 18 GND Ground 19 RSVD Reserved 20 GND Ground 21 HSIp(1) Receiver Lane 1, Differential pair 22 HSIn(1) 23 GND Ground 24 GND Ground 25 HSIp(2) Receiver Lane 2, Differential pair 26 HSIn(2) 27 GND Ground 28 GND Ground 29 HSIp(3) Receiver Lane 3, Differential pair 30 HSIn(3) 31 GND Ground 32 RSVD Reserved 33 RSVD Reserved 34 GND Ground 35 HSIp(4) Receiver Lane 4, Differential pair 36 HSIn(4) 37 GND Ground 38 GND Ground 39 HSIp(5) Receiver Lane 5, Differential pair 40 HSIn(5) 41 GND Ground 42 GND Ground 43 HSIp(6) Receiver Lane 6, Differential pair 44 HSIn(6) 45 GND Ground 46 GND Ground 47 HSIp(7) Receiver Lane 7, Differential pair 48 HSIn(7) 49 GND Ground 50 RSVD Reserved 51 GND Ground 52 HSIp(8) Receiver Lane 8, Differential pair 53 HSIn(8) 54 GND Ground 55 GND Ground 56 HSIp(9) Receiver Lane 9, Differential pair 57 HSIn(9) 58 GND Ground 59 GND Ground 60 HSIp(10) Receiver Lane 10, Differential pair 61 HSIn(10) 62 GND Ground 63 GND Ground 64 HSIp(11) Receiver Lane 11, Differential pair 65 HSIn(11) 66 GND Ground 67 GND Ground 68 HSIp(12) Receiver Lane 12, Differential pair 69 HSIn(12) 70 GND Ground 71 GND Ground 72 HSIp(13) Receiver Lane 13, Differential pair 73 HSIn(13) 74 GND Ground 75 GND Ground 76 HSIp(14) Receiver Lane 14, Differential pair 77 HSIn(14) 78 GND Ground 79 GND Ground 80 HSIp(15) Receiver Lane 15, Differential pair 81 HSIn(15) 82 GND Ground