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
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.
The following table shows the sequence of populating memory modules for independent mode when two processors (processor 1 and processor 2) are installed.
| Total DIMMs | Processor 1 | |||||||
| 16 | 14 | 12 | 10 | 7 | 5 | 3 | 1 | |
| 2 DIMMs Note 1 | 7 | |||||||
| 8 DIMMs Note 2 | 14 | 10 | 7 | 3 | ||||
| 16 DIMMs Note 3 | 16 | 14 | 12 | 10 | 7 | 5 | 3 | 1 |
| Total DIMMs | Processor 2 | |||||||
| 32 | 30 | 28 | 26 | 23 | 21 | 19 | 17 | |
| 2 DIMMs Note 1 | 23 | |||||||
| 8 DIMMs Note 2 | 30 | 26 | 23 | 19 | ||||
| 16 DIMMs Note 3 | 32 | 30 | 28 | 26 | 23 | 21 | 19 | 17 |
If 2 DIMMs are installed for two processors, only 16 GB (1Rx8) / 32 GB (2Rx8) / 64 GB (2Rx4) RDIMMs are supported.
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.
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.