5  Serial port connector 6  Rear USB connectors
7  Second management Ethernet connector 8  XCC system management port
9  Internal USB connector
10  Riser 1 slot
11  OCP 3.0 slot 12  CMOS battery (CR2032)
13  M.2 power connector 14  Leak detection connector
15  Front USB connector
16  7mm backplane power connector
17  PCIe connector 3
18  Fan connectors
19  Front I/O connector (for Y cable) 20  Front I/O connector 
21  Backplane 3 power connector
22  PCIe connector 1
23  PCIe connector 2
24  Backplane 2 power connector
25  PCIe connector 4 26  CFF Retimer connector
27  CFF expander power connector
28  Intrusion switch connector
29  Backplane 1 power connector
30  PCIe connector 6
31  CFF RAID/HBA power connector  32  PCIe connector 7
33  PCIe connector 8
34  External diagnostics connector
35  Front VGA connector 36  PCIe connector 5
37  Riser 3 sideband connector
38  PCIe connector 9
39  PCIe connector 10
40  Power supply 1 connector
41  Riser 3 power connector 42  Power supply 2 connector
43  GPU power connector
44  Riser 2 slot
45  Firmware and RoT security module connector
46  SATA connector 0
47  SATA connector 1 48  SATA connector 2
49  M.2/7mm backplane signal connector
50  Backplane power connector
51  Backplane sideband connector
Notes: 
•  The front I/O module on rack latch is connected to connector 
20 . See “Front I/O connectors” on page 
279
.
•  The front I/O module on media bay with an integrated diagnostics panel (an LCD diagnostics display) is 
connected to connector 
20 . See “Front I/O connectors” on page 279.
•  The front I/O module on media bay without LCD diagnostics display is connected to connectors 
19  and 
20  using a Y cable. See “Front I/O connectors” on page 279.
System-board-assembly switches
The following illustrates locations and functions of the switch block on the on the system board assembly 
which contains the system I/O board and processor board.
Important:
1.  Before you change any switch settings or move any jumpers, turn off the server; then, disconnect all 
power cords and external cables. Review the following information:
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ThinkSystem SR650 V3 User Guide