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v DIMMs must be installed in pairs for non-mirroring mode and in sets of four for
v A minimum of two DIMMs must be installed in the MAX5 for each microprocessor
v The maximum operating speed of the MAX5 is determined by the slowest DIMM
v The MAX5 does not come with any DIMMs installed when you purchase it as a
v The server supports non-mirroring mode and memory-mirroring mode.
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IBM System x3850 X5 and x3950 X5 Types 7145 and 7146: Installation and User's Guide
Table 9. DIMM banks and connectors (continued)
Bank of DIMMs
3rd bank of DIMMs
4th bank of DIMMs
memory-mirroring mode.
in the host server.
installed in the MAX5.
option. When you install DIMMs, install them in the order shown in the following
tables to optimize system performance.
– Non-mirroring mode. When you use the non-mirroring mode, install DIMMs
as indicated in the following table:
Table 10. Non-mirroring mode DIMM population sequence for the MAX5 memory expansion
module
Pairs of DIMMs
Pair 1
Pair 2
Pair 3
Pair 4
Pair 5
Pair 6
Pair 7
Pair 8
Pair 9
Pair 10
Pair 11
Pair 12
Pair 13
Pair 14
Pair 15
Pair 16
Note: When you populate DIMMs in the MAX5, populate the larger capacity
DIMMs first; then the smaller capacity DIMMs.
– Memory-mirroring mode. When you use the mirroring mode feature,
consider the following information:
- Memory-mirroring mode replicates and stores data on sets of DIMMs
simultaneously. If a failure occurs, the memory controller switches from the
primary set of DIMMs to the backup set of DIMMs. To enable memory
mirroring through the Setup utility, select System Settings → Memory. For
more information, see "Using the Setup utility" on page 87.
DIMM connectors
17, 18, 19, 20, 21, 22, 23, and 24
25, 26, 27, 28, 29, 30, 31, and 32
DIMM connector population sequence
28, 29
9, 16
1, 8
20, 21
26, 31
11, 14
3, 6
18, 23
27, 30
10, 15
2, 7
19, 22
25, 32
12, 13
4, 5
17, 24
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