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Figure 31. 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.
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.
Table 7. Normal mode DIMM installation sequence
Number of installed
microprocessor
DIMM connector population sequence
One microprocessor installed
1, 4, 9, 12, 2, 5, 8, 11, 3, 6, 7, 10
Two microprocessors installed
1, 13, 4, 16, 9, 21, 12, 24, 2, 14, 5, 17, 8, 20, 11, 23, 3, 15, 6, 18, 7, 19, 10, 22
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 103. When you use the memory
mirrored channel feature, consider the following information:
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Lenovo System x3650 M4 HD Installation and Service Guide
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