IBM Redbooks x3850 X5, Installation And User Manual

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v
When you populate DIMMs in the memory expansion module, populate the
larger capacity DIMMs first; then the smaller capacity DIMMs. See Table 12 on
page 85 for non-mirroring mode DIMM population sequence and Table 13 on
page 85 for memory-mirroring mode DIMM population sequence.
v
The memory expansion module provides eight memory ports (memory
channels) and each memory port supports up to four DIMMs. Do not mix
DIMMs with x4 technology (DIMMs with DRAMs that are organized with 4
data lanes) and x8 technology (DIMMs with DRAMs that are organized with 8
data lanes) in the same memory port.
Table 10. Memory ports and DIMM connectors
Memory ports DIMM connectors
1 1, 2, 7, and 8
2 3, 4, 5, and 6
3 9, 10, 15, and 16
4 11, 12, 13, and 14
5 17, 18, 23, and 24
6 19, 20, 21, and 22
7 25, 26, 31, and 32
8 27, 28, 29, and 30
Note: 2 GB, 4 GB, and 8 GB DIMMs are x4 technology DIMMs. 16 GB and 32 GB DIMMs
are x8 technology DIMMs.
v Do not mix DIMMs with 1 Gb (gigabit) technology, 2 Gb DRAM technology, or
other gigabit DRAM technologies in banks of eight DIMMs on memory ports
that are on the same memory controller. This is not supported in the memory
expansion module. The following table lists the DIMM connectors for each bank
of eight DIMMs that are on the memory ports within the same memory
controller.
Table 11. DIMM banks and connectors
Bank of DIMMs DIMM connectors
1st bank of DIMMs 1, 2, 3, 4, 5, 6, 7, and 8
2nd bank of DIMMs 9, 10, 11, 12, 13, 14, 15, and 16
3rd bank of DIMMs 17, 18, 19, 20, 21, 22, 23, and 24
4th bank of DIMMs 25, 26, 27, 28, 29, 30, 31, and 32
v
DIMMs must be installed in pairs for non-mirroring mode and in sets of four for
memory-mirroring mode.
v
A minimum of two DIMMs must be installed in the memory expansion module
for each microprocessor in the host server.
v The maximum operating speed of the memory expansion module is determined
by the slowest DIMM installed in the memory expansion module.
v
The memory expansion module does not come with any DIMMs when you
purchase it as an optional device. When you install DIMMs, install them in the
order shown in the following tables to optimize system performance.
v
The server supports non-mirroring mode and memory-mirroring mode through
the host server.
–
Non-mirroring mode . When you use the non-mirroring mode, install DIMMs
as indicated in the following table.
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IBM System x3850 X5 and x3950 X5 Types 7145, 7146, 7143, and 7191: Installation and User's Guide