Lenovo ThinkStation S20 - Manual (Page 14)

Identifying parts on the system board
Figure 4 “System board parts locations” on page 8 shows the location of the parts on the system board.
Figure 4. System board parts locations
1 Microprocessor 12 V power connector 16 Front panel connector
2 Microprocessor fan connector 17 Cover presence switch connector
3 Microprocessor 18 Thermal sensor connector
4 Memory slots (6) 19 PS/2 connector
5 24-pin system power connector 20 Front audio connector
6 Hard disk drive fan assembly connector 21 Internal speaker connector
7 Diskette drive connector 22 PCI adapter card slot
8 Card reader connector 23 PCI Express x1 adapter card slot
9 Front USB connector 24 PCI Express x16 graphics adapter card slot
10 SATA connectors (5) 25 PCI Express x4 adapter card slot
11 Adapter card fan connector 26 PCI Express x16 graphics adapter card slot
12 SAS (Serial Attached SCSI) LED connector 27 Second COM port connector
13 Battery 28 Rear fan assembly connector
8 ThinkStation Hardware Installation and Replacement Guide