Lenovo 6491 - Manual (Page 43)

Locating components
The following illustration will help you locate the various components in your
computer.
1 Optical drive 5 Power supply
2 Diskette drive 6 PCI adapter connector
3 Memory modules 7 PCI Express x16 graphics adapter or
PCI Express x1 adapter connector
(some models)
4 Battery 8 PCI Express x1 adapter connector or
PCI Express x16 graphics adapter
(some models)
Chapter 3. Installing options 23