Dell Precision 7920 Owner's Manual page 60

1 PCIe 3*16 (4 slots) and 3*8 ( 1 slot)
3 CPU1 memory slots
5 CPU1 memory slots
7 CPU1 PCIe 3 x16 Slots (2)
9 CPU1_DIS
11 CPU fan 0 connector
13 Power 2
15 System Fan 3
17 CPU1 memory slots
19 System Fan 2
21 System Fan 1
23 Power cable 1
25 Coin Cell battery
27 Front Panel USB
29 Flex USB
60 Removing and installing components
2 Rear fan 0 connector
4 CPU1 socket
6 Rear fan 0 connector
8 Front panel audio
10 Piezo speaker
12 Power Control
14 Intrusion switch connector
16 Internal speaker connector
18 CPU 0 socket
20 CPU1 memory slots
22 LPC_ESPI_Debug
24 CPU fan 1
26 ODD cable
28 USB 2_Int
30 Power remote