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.
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.
DIMM configurations that support Software Guard Extensions (SGX). See Enable Software Guard Extensions (SGX) to enable this feature.
For the DIMM restrictions, see Supported DIMMs.
| Total DIMMs | Processor 1 | ||||||||||||||||
| 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | ||
| 1 DIMM | 7 | ||||||||||||||||
| 4 DIMMs | 14 | 10 | 7 | 3 | |||||||||||||
| 8 DIMMs | 16 | 14 | 12 | 10 | 7 | 5 | 3 | 1 | |||||||||
| 12 DIMMs | 16 | 14 | 13 | 12 | 10 | 9 | 8 | 7 | 5 | 4 | 3 | 1 | |||||
| 16 DIMMs | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | |
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.
DIMM configurations that support Software Guard Extensions (SGX). See Enable Software Guard Extensions (SGX) to enable this feature.
For the DIMM restrictions, see Supported DIMMs.
| Total DIMMs | Processor 1 | ||||||||||||||||
| 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | ||
| 2 DIMMs | 7 | ||||||||||||||||
| 8 DIMMs | 14 | 10 | 7 | 3 | |||||||||||||
| 16 DIMMs | 16 | 14 | 12 | 10 | 7 | 5 | 3 | 1 | |||||||||
| 24 DIMMs | 16 | 14 | 13 | 12 | 10 | 9 | 8 | 7 | 5 | 4 | 3 | 1 | |||||
| 32 DIMMs | 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 DIMMs | 23 | ||||||||||||||||
| 8 DIMMs | 30 | 26 | 23 | 19 | |||||||||||||
| 16 DIMMs | 32 | 30 | 28 | 26 | 23 | 21 | 19 | 17 | |||||||||
| 24 DIMMs | 32 | 30 | 29 | 28 | 26 | 25 | 24 | 23 | 21 | 20 | 19 | 17 | |||||
| 32 DIMMs | 32 | 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | |
Supported DIMMs
1P: One processor
2P: Two processors
| DIMM configuration | Slot No. | Supported DIMMs |
|---|---|---|
| 1 DIMM (1P) or 2 DIMMs (2P) | 0 |
|
| 4 DIMMs (1P) or 8 DIMMs (2P) | 0 |
Note When installing DIMMs for 1 processor, users can also install the DIMMs in Slots 16, 12, 5, and 1. |
| 8 DIMMs (1P) or 16 DIMMs (2P) | 0 |
|
| 12 DIMMs (1P) or 24 DIMMs (2P) | 0 or 1 |
|
| 16 DIMMs (1P) or 32 DIMMs (2P) | 0 or 1 |
|