Lenovo 6491 - Manual (Page 46)

The following illustration shows the locations of parts on the system board for
some computer models.
1 Microprocessor fan connector 12 Front panel connector
2 Microprocessor and heat sink 13 SATA IDE connectors (2)
3 Memory connector 1 14 Front USB connectors (2)
4 Memory connector 2 15 Serial (COM) connector
5 Clear CMOS/Recovery jumper 16 PCI adapter connectors
6 Power connector 17 Front audio connector
7 Diskette drive connector 18 CD-IN connector
8 IDE connector 1 19 PCI Express x16 graphics adapter
connector
9 IDE connector 2 20 PCI Express x1 adapter connector
10 Battery 21 System fan connector
11 Power fan connector 22 12v power connector
26 User Guide