IBM x3690 X5 Service Manual page 403

(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. The following table shows the DIMM connectors on the eight memory
ports.
Table 24. DIMM connectors on each memory port
Memory ports
1
2
3
4
5
6
7
8
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) DRAM technology, 2 Gb DRAM
technology, or other gigabit DRAM technologies in banks of eight DIMMs on
memory ports (memory channels) that are on the same memory controller. This
is not supported on the MAX5. 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 25. DIMM connectors on memory ports within the same memory controller
Bank of DIMMs
1st bank of DIMMs
2nd bank of DIMMs
3rd bank of DIMMs
4th bank of DIMMs
v DIMMs must be installed in pairs for non-mirroring mode and in sets of four for
memory-mirroring.
v A minimum of two DIMMs must be installed in the MAX5 for each
microprocessor in the host server.
v The maximum operating speed of the MAX5 is determined by the slowest
DIMM installed in the MAX5.
v The MAX5 does not come with any DIMMs installed when you purchase it as a
option. When you install DIMMs, install them in the order shown in the
following tables to optimize system performance.
v The MAX5 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:
Table 26. Non-mirroring mode DIMM population sequence for the MAX5 memory expansion
module
Pairs of DIMMs
Pair 1
DIMM connectors
1, 2, 7, and 8
3, 4, 5, and 6
9, 10, 15, and 16
11, 12, 13, and 14
17, 18, 23, and 24
19, 20, 21, and 22
25, 26, 31, and 32
27, 28, 29, and 30
DIMM connectors
1, 2, 3, 4, 5, 6, 7, and 8
9, 10, 11, 12, 13, 14, 15, and 16
17, 18, 19, 20, 21, 22, 23, and 24
25, 26, 27, 28, 29, 30, 31, and 32
DIMM connector population sequence
28, 29
Chapter 5. Removing and replacing components
385