Lenovo ThinkCentre E50 -FR - Manual (Page 11)

Locating components
The following illustration will help you locate the various components in your
computer.
1 Microprocessor and heat sink 4 PCI connectors
2 Memory modules 5 PCI adapter
3 AGP adapter or PCI Express
x16 graphics adapter connector
(some models)
6 Power supply
Chapter 1. Locations 3