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Figure 16. Memory modules and processors layout
The memory-channel configuration table below shows the relationship between the processors, memory
controllers, memory channels, and memory module slot numbers.
Table 12. Memory slot and channel identification
Process-
or
2
1
5
UMC No.
Channel
F
E
D
No.
DIMM
24 23 22 21 20 19 18 17 16 15 14 13
No.
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.
Server model with one processor
The following table shows the DIMM population sequence when one processor is installed.
ThinkSystem SR645 V3 User Guide
40
CPU 2
0
4
3
9
10
6
C
B
A
G
H
I
11
7
8
2
1
5
J
K
L
F
E
D
12 11 10
CPU 1
0
4
3
9
10 6 11 7
C
B
A
G
H
I
9
8
7
6
5
4
8
J
K
L
3
2
1
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