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
Processor 0
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
2 DIMMs 1 3
4 DIMMs 1 3 14 16
8 DIMMs 1 3 5 7 10 12 14 16
12 DIMMs 1 2 3 4 5 7 10 12 13 14 15 16
16 DIMMs 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
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
Processor 0
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
4 DIMMs 1 3
8 DIMMs 1 3 14 16
12 DIMMs 1 3 5 7 14 16
16 DIMMs 1 3 5 7 10 12 14 16
24 DIMMs 1 2 3 4 5 7 10 12 13 14 15 16
32 DIMMs 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Configura-
tion
Processor 1
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
4 DIMMs 17 19
8 DIMMs 17 19 30 32
12 DIMMs 17 19 21 23 30 32
16 DIMMs 17 19 21 23 26 28 30 32
24 DIMMs 17 18 19 20 21 23 26 28 29 30 31 32
90 HR650X V2 User Guide
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