Independent mode with mixing rank
Follow the memory module installation sequence in this section when installing memory modules with different ranks in independent mode.
Single-rank RDIMMs can be mixed with dual-rank RDIMMs when there are 16 DIMMs populated for each processor.
Mixing of DDR5 4800 MHz 128 GB and 256 GB 3DS RDIMMs is supported when there are 16 DIMMs populated for each processor.
Quad-rank 3DS RDIMMs can be mixed with octal-rank 3DS RDIMMs when there are 16 DIMMs populated for each processor.
If a memory channel has two DIMMs with different ranks, populate the DIMM with a higher number of ranks in slot 0 (furthest from the processor) first.
DIMM slot installation sequence for one processor
When installing DIMMs with different ranks with only one processor (processor 1) installed, follow the sequence below and install higher rank DIMMs first; then, install the lower rank DIMMs into the remaining slots.
| Processor 1 | |||||||||||||||||
| DIMM slot | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | |
| Sequence | 8 | 16 | 7 | 15 | 4 | 12 | 3 | 11 | 9 | 1 | 10 | 2 | 13 | 5 | 14 | 6 | |
DIMM slot installation sequence for two processors
When installing DIMMs with different ranks with two processors (processor 1 and processor 2) installed, follow the sequence below and install higher rank DIMMs first; then, install the lower rank DIMMs into the remaining slots.
| Processor 1 | |||||||||||||||||
| DIMM slot | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | |
| Sequence | 15 | 31 | 13 | 29 | 7 | 23 | 5 | 21 | 17 | 1 | 19 | 3 | 25 | 9 | 27 | 11 | |
| Processor 2 | |||||||||||||||||
| DIMM slot | 32 | 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | |
| Sequence | 16 | 32 | 14 | 30 | 8 | 24 | 6 | 22 | 18 | 2 | 20 | 4 | 26 | 10 | 28 | 12 | |