Lenovo ThinkSystem SR650 - Page 142

Figure 101. DIMM slots on the system board
Your server supports the following memory modes:
• “Independent mode” on page 134
• “Mirroring mode” on page 136
• “Rank sparing mode” on page 137
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.
Notes:
• If there are three identical DIMMs to be installed for CPU1, and the three DIMMs have the same Lenovo
part number, move the DIMM to be installed in slot 8 to slot 1.
• If there are ten identical DIMMs to be installed for CPU1, and the ten DIMMs have the same Lenovo part
number, move the DIMM to be installed in slot 6 to slot 12.
Table 10. Independent mode with one processor
Total Processor 1 Total
DIMMs 12 11 10 9 8 7 6 5
4 3 2 1 DIMMs
1 5 1
2 8 5 2
3 8 5 3 3
4 10 8 5 3 4
5 10 8 5 3 1 5
6 12 10 8 5 3 1 6
134 ThinkSystem SR650 Maintenance Manual