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.
Memory module mixing rules in independent mode
| DIMMs | Coexist in a system |
|---|---|
| RDIMMs and MRDIMMs | x |
| 3DS RDIMMs and other RDIMM types | x |
| x4 DIMMs and x8 DIMMs | x |
| Different DRAM density (16Gbit, 24Gbit, and 32Gbit) | x |
| DIMMs of different ranks | x |
| DIMMs of different capacity | x |
| DIMMs from different vendors | √ |
Note
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DIMM installation order for independent mode
The following tables show the memory module installation orders for independent mode.
| Total DIMMs | Processor 1 | ||||||||||||||||
| 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | ||
| 1 DIMM1 | 7 | ||||||||||||||||
| 4 DIMMs1,2 | 14 | 10 | 7 | 3 | |||||||||||||
| 4 DIMMs1,2,3 | 16 | 12 | 5 | 1 | |||||||||||||
| 8 DIMMs1,2,4 | 16 | 14 | 12 | 10 | 7 | 5 | 3 | 1 | |||||||||
| 12 DIMMs1,2,4 | 16 | 14 | 13 | 12 | 10 | 9 | 8 | 7 | 5 | 4 | 3 | 1 | |||||
| 16 DIMMs1,2,4 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | |
| Total DIMMs | Processor 1 | ||||||||||||||||
| 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | ||
| 2 DIMMs1 | 7 | ||||||||||||||||
| 8 DIMMs1,2 | 14 | 10 | 7 | 3 | |||||||||||||
| 8 DIMMs1,2,3 | 16 | 12 | 5 | 1 | |||||||||||||
| 16 DIMMs1,2,4 | 16 | 14 | 12 | 10 | 7 | 5 | 3 | 1 | |||||||||
| 24 DIMMs1,2,4 | 16 | 14 | 13 | 12 | 10 | 9 | 8 | 7 | 5 | 4 | 3 | 1 | |||||
| 32 DIMMs1,2,4 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | |
| Total DIMMs | Processor 2 | ||||||||||||||||
| 32 | 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | ||
| 2 DIMMs1 | 23 | ||||||||||||||||
| 8 DIMMs1,2 | 30 | 26 | 23 | 19 | |||||||||||||
| 8 DIMMs1,2,3 | 32 | 28 | 21 | 17 | |||||||||||||
| 16 DIMMs1,2,4 | 32 | 30 | 28 | 26 | 23 | 21 | 19 | 17 | |||||||||
| 24 DIMMs1,2,4 | 32 | 30 | 29 | 28 | 26 | 25 | 24 | 23 | 21 | 20 | 19 | 17 | |||||
| 32 DIMMs1,2,4 | 32 | 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | |
- DIMMs in different DIMM configurations are subject to the following restrictions:
DIMM configuration Slot No. Supported DIMMs 1-DIMM (1P) or 2-DIMM (2P) 0 16 GB, 32 GB (2Rx8), or 64 GB RDIMMs 1 N/A 4-DIMM (1P) or 8-DIMM (2P) 0 32/48/64 GB RDIMMs 1 N/A 8-DIMM (1P) or 16-DIMM (2P) 0 16/32/48/64/96/128 GB RDIMMs, 32/64 GB MRDIMMs, or 256 GB 3DS RDIMMs 1 N/A 12-DIMM (1P) or 24-DIMM (2P) 0 32 GB (2Rx8) RDIMMs 1 Same as slot 0 16-DIMM (1P) or 32-DIMM (2P) 0 32 GB (2Rx8), 64 GB, 96 GB, or 128 GB RDIMMs or 256 GB 3DS RDIMMs 1 Same as slot 0 1P: one processor; 2P: two processors The DIMM configurations 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.
The DIMM configurations are optional. For optimal performance, you are recommended to install DIMMs in the standard installation order. The optional installation order is used only for special requirements.
The DIMM configurations support the Software Guard Extensions (SGX) feature (XCC only). See Enable Software Guard Extensions (SGX) to enable this feature.