Independent mode
Independent mode provides high performance memory capability. You can populate all channels with no
matching requirements. Individual channels can run at different DIMM timings, but all channels must run at
the same interface frequency.
Notes:
• All DIMMs to be installed must be the same type.
• When you install DIMMs with same rank and different capacity, install the DIMM that has the highest
capacity first.
The following table shows the DIMM population sequence for independent mode when only one processor
(CPU1) is installed.
Note: If there are three identical DIMMs to be installed for CPU1, and the three DIMMs have the same
Lenovo part number, install the three DIMMs in slots 1, 2, and 3.
Table 10. Independent 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 independent mode when two processors
(CPU1 and CPU2) are installed.
Notes:
• If there are three identical DIMMs to be installed for CPU1, and the three DIMMs have the same Lenovo
part number, install the three DIMMs in slots 1, 2, and 3.
• If there are three identical DIMMs to be installed for CPU2, and the three DIMMs have the same Lenovo
part numbers, install the three DIMMs in slots 10, 11, and 12.
Table 11. Independent 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
112 ThinkSystem ST550 Maintenance Manual
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