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Before installing a DIMM, ensure that all DIMMs to be installed must be the same type. Your server supports
the following types of DIMMs:
• DDR4 RDIMM with ECC technology
• DDR4 LRDIMM with ECC technology
Note: It is recommended to install DIMMs with the same rank in each channel.
The following illustration helps you to locate the DIMM slots on the system board.
Figure 11. DIMM slots on the system board
Your server supports the following memory modes:
• "Mirroring mode" on page 37
• "Rank sparing mode" on page 38
Mirroring mode
In mirroring mode, each DIMM in a pair must be identical in size and architecture. The channels are grouped
in pairs with each channel receiving the same data. One channel is used as a backup of the other, which
provides redundancy.
Note: All DIMMs to be installed must be the same type with the same capacity, frequency, voltage, and
ranks.
The following table shows the DIMM population sequence for mirroring mode when only one processor
(Processor 1) is installed.
Table 9. Mirroring mode with one processor
Total
DIMMs
12
11
2
3
4
6
12
8
9
12
12
12
11
Processor 1
10
9
8
10
8
10
8
10
9
8
10
8
10
9
8
7
6
5
5
5
5
5
7
6
5
6
5
7
6
5
Chapter 5
4
3
2
1
3
3
1
3
3
1
4
3
4
3
2
1
4
3
2
1
.
Hardware replacement procedures
Total
DIMMs
2
3
4
6
8
9
12
37
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