Installing A Memory Module - IBM 7940 Problem Determination And Service Manual

2. Turn off the server and peripheral devices and disconnect all power cords and
3. Remove the server cover (see "Removing the cover" on page 31).
4. Open the retaining clip on each end of the DIMM connector.
5. Lift the DIMM out of the connector.
6. If you are instructed to return the DIMM, follow all packaging instructions, and

Installing a memory module

For information about the types of dual inline memory modules (DIMMs) that the
server supports and other information that you must consider when installing
DIMMs, see the User's Guide on the IBM System x Documentation CD.
To optimize system performance in a single-microprocessor or dual-microprocessor
configuration, install DIMMs in the following sequence. Do not install DIMMs in
connectors 7 through 12 if microprocessor socket 2 (system-board identifier CPU2)
is empty.
The following illustration shows the DIMM slots (memory connectors) on the system
board.
40
IBM System x3455 Type 7940 and 7941: Problem Determination and Service Guide
external cables; then, remove the server from the rack.
Attention: To avoid breaking the retaining clips or damaging the DIMM
connectors, open and close the clips gently.
use any packaging materials for shipping that are supplied to you.
Table 6. DIMM installation sequence
Number of DIMMs DIMM connector population with
installed one microprocessor installed
2
4
6
8
10
12
1, 2
1, 2, 3, 4
1, 2, 3, 4, 5, 6
Not supported
Not supported
Not supported
DIMM connector population with
two microprocessors installed
1, 2
1, 2, 7, 8
1, 2, 3, 4, 7, 8
1, 2, 3, 4, 7, 8, 9, 10
1, 2, 3, 4, 5, 6, 7, 8, 9, 10
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12