Notes:
• All DIMMs to be installed must be the same type with the same capacity, frequency, voltage, and ranks.
• If the rank of installed DIMMs is one rank, rank sparing mode is not supported. If the rank of installed
DIMMs is more than one rank, follow the installation rules listed in the following tables.
The following table shows the DIMM population sequence for rank sparing mode when only one processor
(CPU1) is installed.
Table 14. Rank sparing mode with one processor
Total Processor 1 Total
DIMMs 1 2 3 4
5 6 DIMMs
1 3 1
2 3 4 2
3 2 3 4 3
4 2 3 4 5 4
5 1 2 3 4 5 5
6 1 2 3 4 5 6 6
The following table shows the DIMM population sequence for rank sparing mode when two processors
(CPU1 and CPU2) are installed.
Table 15. Rank sparing mode with two processors
Total Processor 1 Processor 2 Total
DIMMs 1 2 3 4
5 6 7 8 9 10 11 12 DIMMs
2 3 10 2
3 3 4 10 3
4 3 4 9 10 4
5 2 3 4 9 10 5
6 2 3 4 9 10 11 6
7 2 3 4 5 9 10 11 7
8 2 3 4 5 8 9 10 11 8
9 1 2 3 4 5 8 9 10 11 9
10 1 2 3 4 5 8 9 10 11 12 10
11 1 2 3 4 5 6 8 9 10 11 12 11
12 1 2 3 4 5 6 7 8 9 10 11 12 12
Install a DIMM
Use this information to install a DIMM.
“Read the
installation
Guidelines” on
page 59
“Power off
the server
for this task”
on page 12
“ATTENTION:
Static Sensitive Device
Ground package before opening”
on page 60
114 ThinkSystem ST550 Maintenance Manual
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