HP dx2420 Service Reference Guide: HP Compaq dx2420 Business PC - Page 79
PCI Express, x1, x4, x8, and x16 PCI Express Connector, Pin A, Signal
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P1 Ground P5 BP9 V 5 P13 V 12 S = Data, P = Power P2 V 3.3 P6 Ground P10 Ground P14 V12 PCI Express x1, x4, x8, and x16 PCI Express Connector P3 V 3.3 P7 V 5 P11 Reserved P15 V 12 P4 Ground P8 V 5 P12 Ground Pin A Pin Signal 1 PRSNT1 2 +12V 3 +12V 4 GND 5 JTAG2 26 PERn(2) 27 GND 28 GND 29 PERp3 30 PERn3 51 GND 52 PERp8 53 PERN8 54 GND 55 GND Pin Signal 6 JTAG3 7 JTAG4 8 JTAG5 9 +3.3V 10 +3.3V 31 GND 32 RSVD 33 RSVD 34 GND 35 PERp4 56 PERp9 57 PERn9 58 GND 59 GND 60 PERp10 Pin Signal 11 PERST# 12 GND 13 REFCLK+ 14 REFCLK15 GND 36 PERn4 37 GND 38 GND 39 PERp5 40 PERn5 61 PERn10 62 GND 63 GND 64 PERp11 65 PERn11 Pin Signal 16 PERp0 17 PERn0 18 GND 19 RSVD 20 GND 41 GND 42 GND 43 PERp6 44 PERn6 45 GND 66 GND 67 GND 68 PERp12 69 PERn12 70 GND Pin Signal 21 PERp1 22 PERn1 23 GND 24 GND 25 PERp2 46 GND 47 PERp7 48 PERn7 49 GND 50 RSVD 71 GND 72 PERp13 73 PERn13 74 GND 75 GND PCI Express 73