Lenovo ThinkSystem SR665 V3 User Manual page 55

Memory module installation guideline
Follow the rules below when installing DIMMs:
• Mixing DIMMs from different vendors is supported in a system.
• Mixing x4 and x8 DIMMs is not allowed in a system.
• Only one rank and two rank DIMM mixing is allowed in a system.
• When installing DIMMs with different capacity, install the DIMM with the highest capacity first following
population sequence.
• For best performance, the population recommends identical memory capacity and rank per memory
channel across all 12 channels and processors.
Memory module installation order
Notes: In the following tables:
• S1–S24 indicate DIMM slots 1–24.
• 1–24 indicate the installation order.
For example, when 12 DIMMs are installed for two processors, the installation order is slot 7, 19, 6, 18, 9, 21,
4, 16, 8, 20, 5, 17.
With one processor
The following table shows the DIMM population sequence when one processor is installed.
Table 17. DIMM population sequence for one processor
Total DIMMs
S12
1 DIMM
2 DIMMs
4 DIMMs
6 DIMMs
8 DIMMs
10 DIMMs
12 DIMMs 11
With two processors
The following table shows the DIMM population sequence when two processors are installed.
Table 18. DIMM population sequence for two processors
Total DIMMs
S12
2 DIMMs
4 DIMMs
8 DIMMs
12 DIMMs
S11 S10 S9 S8
3
3 5
7 3 5
7 9 3 5
7 9 3 5
S11 S10 S9 S8
5
5 9
Processor 1
S7 S6 S5
1
1 2
1 2
1 2 6
1 2 6
1 2 6
1 2 6
Processor 1
S7 S6 S5
1
1 3
1 3
1 3 11
.
Chapter 5 Hardware replacement procedures
S4 S3 S2
4
4
4 8
4 10 8
4 10 8
S4 S3 S2
7
7
S1
12
S1
45