Removing A Memory Module; Installing A Memory Module - IBM x3655 - System - 7985 Service Manual

Removing a memory module

To remove a dual inline memory module (DIMM), complete the following steps.
DIMM
1. Read the safety information that begins on page vii and "Installation guidelines"
2. Turn off the server and all attached devices.
3. Disconnect all external cables and power cords.
4. Remove the cover (see "Removing the cover" on page 39).
5. Remove the riser-card assembly (see "Removing the riser-card assembly" on
6. Remove the air baffle (see "Removing the air baffle" on page 41).
7. Open the retaining clip on each end of the DIMM connector and lift the DIMM
8. Replace the DIMM or remove the second DIMM of the pair.
9. 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.
v The server comes with a minimum of two 512 MB DIMMs, installed in slots 1 and
62
IBM System x3655 Type 7985: Problem Determination and Service Guide
on page 35.
page 120).
Attention: To avoid breaking the retaining clips or damaging the DIMM
connectors, open and close the clips gently.
from the connector.
use any packaging materials for shipping that are supplied to you.
2. When you install additional DIMMs, you must install two identical DIMMS at a
time, in the order shown in the following table, to maintain performance:
Table 3. DIMM installation sequence
DIMMs 1 microprocessor installed
2 DIMM connectors 1 and 2
4 DIMM connectors 1 through 4
6 DIMM connectors 1 through 6
Retaining
clip
2 microprocessors installed
Not applicable
DIMM connectors 1 and 2 and 9 and
10
DIMM connectors 1 through 4 and 9
and 10