Hardware options installation 55
• In multiprocessor configurations, each processor must have a valid Lockstep memory mode
configuration.
• In multiprocessor configurations, each processor may have a different valid Lockstep memory mode
configuration.
Population order
For Lockstep memory mode configurations with a single processor or multiple processors, populate the DIMM
slots in the following order:
• First: B and C
• Last: E and F
Do not populate the DIMM slots A and D.
After installing the DIMMs, to configure memory protection mode, use RBSU ("HP ROM-Based Setup Utility"
on page 83).
Installing a DIMM
1. Power down the server (on page 17).
2. Remove all power:
a. Disconnect each power cord from the power source.
b. Disconnect each power cord from the server.
3. Do one of the following:
o Extend the server from the rack (on page 17).
o Remove the server from the rack (on page 18).
4. Remove the access panel (on page 19).
5. Open the DIMM slot latches.
6. Install the DIMM.
7. Install the access panel (on page 20).
8. Install the server into the rack ("Installing the server into the rack" on page 27).