IBM THINKCENTRE 8086 User Manual page 27

2. Pivot the drive bay assembly upward to gain access to the system board.
3. To locate the memory connectors. See "Identifying parts on the system board"
on page 11.
4. Open the retaining clips.
5. Make sure that the notch 1 on the memory module aligns correctly with the
connector key 2 on the system board. Push the memory module straight
down into the connector until the retaining clips close.
Chapter 1. Installing options
13