Lenovo x3550 M4 Installation And Service Manual page 250
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2. DIMM slots 13-24 are reserved for microprocessor 2; thus, DIMM slots 13-24 are
The following illustration shows the location of the DIMM connectors on the
system board.
Figure 137. DIMM connectors location
DIMM installation sequence:
Depending on the server model, the server may come with a minimum of one 2
GB or 4 GB DIMM installed in slot 1. When you install additional DIMMs, install
them in the order shown in the following table to optimize system performance.
In general, all three channels on the memory interface for each microprocessor can
be populated in any order and have no matching requirements.
Memory mirrored channel:
Memory mirrored channel mode replicates and stores data on two pairs of DIMMs
within two channels simultaneously.
If a failure occurs, the memory controller switches from the primary pair of
memory DIMMs to the backup pair of DIMMs. To enable memory mirrored
channel through the Setup utility, select System Settings > Memory. For more
information, see "Using the Setup utility" on page 102. When you use the memory
mirrored channel feature, consider the following information:
232
System x3550 M4 Type 7914: Installation and Service Guide
enabled when microprocessor 2 is installed.
Table 21. Normal mode DIMM installation sequence
Number of installed
microprocessor
One microprocessor
installed
Two microprocessors
installed
DIMM connector population sequence
1, 4, 9, 12, 2, 5, 8, 11, 3, 6, 7, 10
1, 13, 4, 16, 9, 21, 12, 24, 2, 14, 5, 17, 8, 20, 11, 23, 3, 15, 6, 18,
7, 19, 10, 22
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