Dimm Installation Sequence - IBM System x3650 M3 4255 Service Manual

DIMM installation sequence

The server comes with a minimum of one 2 GB DIMM installed in slot 3. When you
install additional DIMMs, install them in the order shown in the following table to
optimize system performance. In non-mirroring mode, all three channels on the
memory interface for each microprocessor can be populated in any order and have
no matching requirements. When you install additional DIMMs, install them in the
order shown in the following table, to maintain performance.
You can install DIMMs for microprocessor 2 as soon as microprocessor 2 is
installed. You are not required to fill all the DIMM connectors for microprocessor 1
first.
Important: If you have configured the server to use memory mirroring, do not use
the order in Table 16; go to Table 17 on page 221 and Table 18 on page 221 for
memory mirroring and use the installation order shown there.
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IBM System x3650 M3 Types 4255, 7945, and 7949: Problem Determination and Service Guide
Table 16. DIMM installation sequence
Installed microprocessors
Microprocessor socket 1
Microprocessor socket 2
DIMM 18
DIMM 17
CH2
DIMM 16
DIMM 15
CH1 Microprocessor 2
DIMM 14
DIMM 13
DIMM 12
CH0
DIMM 11
DIMM 10
DIMM 9
DIMM 8 CH2
DIMM 7
DIMM 6
Microprocessor 1
DIMM 5 CH1
DIMM 4
DIMM 3
DIMM 2 CH0
DIMM 1
DIMM connector population sequence
Install the DIMMs in the following sequence: 3, 6, 9, 2, 5, 8,
1, 4, 7
Install the DIMMs in the following sequence: 12, 15, 18, 11,
14, 17, 10, 13, 16