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Independent mode installation order

In independent mode, memory channels can be populated with DIMMs in any order and you can populate all channels for each processor in any order with no matching requirements. Independent mode provides the highest level of memory performance, but lacks failover protection. The DIMM installation order for independent mode varies based on the number of processors and memory modules installed in the server.

Independent mode installation rules​

Follow the rules below when installing memory modules in independent mode:

  • All DDR5 memory modules must operate at the same speed in the same system.

  • Memory installation order must be identical between processors.

  • Memory modules from different vendors are supported.

  • In each memory channel, populate the slot farthest from the processor (slot 0) first.

  • All DIMMs must be all DDR5 RDIMMs.

  • x8 DIMMs and x4 DIMMs cannot be mixed in a system.

  • All memory modules to be installed must be of the same type.

  • All memory modules in a system must have the same number of ranks.

Independent mode with one processor​

The following table shows the sequence of populating memory modules for independent mode when only one processor (processor 1) is installed.

Note

DIMM configurations that support Software Guard Extensions (SGX). See Enable Software Guard Extensions (SGX) to enable this feature.

Table 1. Independent mode with one processor
Total DIMMsProcessor 1
16151413121110987654321
1 DIMM7
4 DIMMsNote 1  14   10  7   3  
8 DIMMsNote 2161412107531
12 DIMMsNote 316141312109875431
16 DIMMsNote 416151413121110987654321
Note

  1. If 4 DIMMs are installed for one processor, only 32GB (2Rx8) RDIMMs, and 32GB (1Rx4) 10x4 RDIMMs are supported. Optionally, users can also install the DIMMs in Slots 16, 12, 5, and 1.

  2. If 8 DIMMs are installed for one processor, only 32GB (2Rx8) RDIMMs, 32GB (1Rx4) 10x4 RDIMMs, and 32GB (2Rx8) MRDIMMs are supported.

  3. If 12 DIMMs are installed for one processor, only 32GB (2Rx8) RDIMMs are supported.

  4. If 16 DIMMs are installed for one processor, only 32GB (2Rx8) RDIMMs are supported.

Independent mode with two processors​

The following table shows the sequence of populating memory modules for independent mode when two processors (processor 1 and processor 2) are installed.

Note

DIMM configurations that support Software Guard Extensions (SGX). See Enable Software Guard Extensions (SGX) to enable this feature.

Table 2. Independent mode with two processors
Total DIMMsProcessor 1
16151413121110987654321
2 DIMMsNote 17
8 DIMMsNote 2  14   10  7   3  
16 DIMMsNote 3161412107531
24 DIMMsNote 416 141312 10987 543 1
32 DIMMsNote 516151413121110987654321
Total DIMMsProcessor 2
32313029282726252423222120191817
2 DIMMsNote 123
8 DIMMsNote 2  30   26  23   19  
16 DIMMsNote 33230282623211917
24 DIMMsNote 432 302928 26252423 212019 17
32 DIMMsNote 532313029282726252423222120191817
Note

  1. If 2 DIMMs are installed for two processors, only 16 GB (1Rx8) / 32 GB (2Rx8) / 64 GB (2Rx4) RDIMMs are supported.

  2. If 8 DIMMs are installed for two processors, only 32 GB (2Rx8) / 48 GB (2Rx8) RDIMMs and 32GB (1Rx4) / 64 GB (2Rx4) 10x4 RDIMMs are supported.

  3. If 16 DIMMs are installed for two processors, only 16 GB (1Rx8) / 32 GB (2Rx8) / 48 GB (2Rx8) RDIMMs, 32GB (1Rx4) / 64 GB (2Rx4) / 96 GB (2Rx4) / 128 GB (2Rx4) 10x4 RDIMMs, 32GB (2Rx8) / 64 GB (2Rx4) MRDIMMs, and 256 GB (4Rx4) 3DS RDIMMs are supported.

  4. If 24 DIMMs are installed for two processors, only 32 GB (2Rx8) RDIMMs are supported.

  5. If 32 DIMMs are installed for two processors, only 32GB (2Rx8) RDIMMs are supported.