Lenovo HR650X V2 User Manual page 98

In mirroring mode, each memory module 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.
Follow the rules below when installing memory modules in mirroring mode:
• All memory modules to be installed must be of the same type with the same capacity, frequency, voltage,
and ranks.
• Mirroring can be configured across channels in the same iMC, and the total DDR4 memory size of the
primary and secondary channels must be the same.
With one processor
The following table shows the memory module population sequence for mirroring mode when only one
processor (Processor 1) is installed.
Table 14. Mirroring mode with one processor
Configura-
tion
1 2
2 DIMMs 1
4 DIMMs 1
8 DIMMs 1
12 DIMMs 1 2
16 DIMMs 1 2
With two processors
The following table shows the memory module population sequence for mirroring mode when two
processors (Processor 1 and Processor 2) are installed.
Table 15. Mirroring mode with two processors
Configura-
tion
1 2
4 DIMMs 1
8 DIMMs 1
12 DIMMs 1
16 DIMMs 1
24 DIMMs 1 2
32 DIMMs 1 2
Configura-
tion
17 18
4 DIMMs 17
8 DIMMs 17
12 DIMMs 17
16 DIMMs 17
24 DIMMs 17 18
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HR650X V2 User Guide
3 4 5 6
3
3
3 5
3 4 5
3 4 5 6
3 4 5 6 7
3
3
3 5 7
3 5 7
3 4 5 7
3 4 5 6 7
19 20 21 22 23
19
19
19 21 23
19 21 23
19 20 21 23
Processor 0
7 8 9 10
7 10
7 10
7 8 9 10
Processor 0
8 9 10
10
10
8 9 10
Processor 1
24 25 26
26
26
11 12 13 14
14
12 14
12 13 14
11 12 13 14
11 12 13 14
14
14
12 14
12 13 14
11 12 13 14
27 28 29 30
30
30
28 30
28 29 30
15 16
16
16
15 16
15 16
15 16
16
16
16
15 16
15 16
31 32
32
32
32
31 32