Independent memory mode installation order
Independent memory mode provides the highest level of memory performance, but lacks failover protection. The DIMM installation order for independent memory mode varies based on the number of processors and memory modules installed in the server.
Follow the rules below when installing memory modules in independent mode:
- Memory population must be identical between processors.
- In each memory channel, populate the slot farthest from the processor (slot 0) first.
- All DDR5 DIMMs installed must be of the same type, capacity, density, rank, and data width.
- All DDR5 DIMMs installed must operate at the same speed in the same system.
The following table shows the sequence of populating memory modules for independent mode.
Note
- Thirty-two memory modules are required for configurations utilizing 64 GB (2Rx4) or 96 GB (2Rx4).
- Sixteen or thirty-two memory modules are required for configurations utilizing 128 GB (2Rx4).
| Total DIMMs | Processor 1 | ||||||||||||||||
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | ||
| 16 DIMMs 1, 2 | 1 | 3 | 5 | 7 | 10 | 12 | 14 | 16 | |||||||||
| 32 DIMMs 1, 2 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | |
| Total DIMMs | Processor 2 | ||||||||||||||||
| 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | ||
| 16 DIMMs 1, 2 | 17 | 19 | 21 | 23 | 26 | 28 | 30 | 32 | |||||||||
| 32 DIMMs 1, 2 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | |
Note
- DIMM configurations that support the Sub NUMA Clustering (SNC) feature, which can be enabled via UEFI. SNC is not supported if DIMM population does not follow the sequence indicated by the table above.
- DIMM configurations that support Software Guard Extensions (SGX), see Enable Software Guard Extensions (SGX) to enable this feature.
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