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Figure 4 “System board part locations” on page 12 shows the locations of the parts on one type of system
board.
Figure 4. System board part locations
1 4-pin power connector
12 SATA connectors (3)
2 Microprocessor
13 Front USB connector 2 (for connecting an additional USB
device)
3 Microprocessor fan connector
14 Clear CMOS (Complementary Metal Oxide Semiconductor)
/Recovery jumper
4 Memory slot 1 (DIMM1)
15 Battery
5 Memory slot 2 (DIMM2) 16 Cover presence switch connector (Intrusion switch
connector)
6 Thermal sensor connector
17 Serial (COM2) connector
7 24-pin power connector 18 Front audio connector
8 Power fan connector
19 Internal speaker connector
9 Parallel connector
20 PCI Express x1 card slots (2)
10 Front panel connector (for connecting LED
indicators and the power switch)
21 PCI Express x16 graphics card slot
11 Front USB connector 1 (for connecting USB
connectors 1 and 2 on the front bezel)
22 System fan connector
12 ThinkCentre User Guide