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.
There should be at least one TruDDR5 DIMM per processor.
Memory population must be identical between processors.
All TruDDR5 memory modules must operate at the same speed in the same system.
Memory modules from different vendors are supported.
x8 DIMMs and x4 DIMMs cannot be mixed in a system.
All memory modules to be installed must be of the same type.
9x4 RDIMM cannot be mixed with non-9x4 RDIMMs in a system.
3DS RDIMM cannot be mixed with non-3DS RDIMMs in a system.
All memory modules in a system must have the same number of ranks, except for below conditions:
Single-rank RDIMMs can be mixed with dual-rank RDIMMs 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.
NoteSystem hang on POST may occur on a server operating in this configuration. In this case, contact Lenovo service to replace the failed DIMM for proper operation.See Independent memory mode with mixing ranks for more information on the installation sequence when installing memory modules with different ranks.
- Different DRAM density (16Gbit, 24Gbit, and 32Gbit) cannot be mixed in a system.NoteThe 16Gbit DRAM is used in 16 GB, 32 GB, and 64 GB RDIMMs. The 24Gbit DRAM is used in 24 GB, 48 GB, and 96 GB RDIMMs. The 32Gbit DRAM is used in 128 GB 2Rx4 RDIMMs.
The 4800 MHz 48 GB and 96 GB RDIMMs are supported only on servers with SPR XCC or MCC processors.
The 5600 MHz 128 GB 2Rx4 RDIMM is supported only on servers with MCC or XCC processors.
Before installing 24Gbit-based RDIMMs in a system with SPR XCC or MCC processors, make sure to apply the UEFI firmware version ESE126H or later to the server first.
Before installing 32Gbit-based RDIMMs in a system with XCC or MCC processors, make sure to apply the UEFI firmware version ESE128E or later to the server first.
Standard DIMM installation order
The following tables show the standard orders of populating memory modules 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 | ||||||||||||||||
2 DIMMs2 | 14 | 7 | |||||||||||||||
4 DIMMs2 | 14 | 10 | 7 | 3 | |||||||||||||
6 DIMMs1,2 | 14 | 12 | 10 | 7 | 3 | 1 | |||||||||||
8 DIMMs1,2,3,4,5 | 16 | 14 | 12 | 10 | 7 | 5 | 3 | 1 | |||||||||
12 DIMMs2,6 | 16 | 14 | 13 | 12 | 10 | 9 | 8 | 7 | 5 | 4 | 3 | 1 | |||||
16 DIMMs2,3,4,6,7,8 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 |
The DIMM configurations support 5600 MHz 24 GB, 48 GB, and 96 GB RDIMMs.
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 support Software Guard Extensions (SGX). See Enable Software Guard Extensions (SGX) to enable this feature.
The DIMM configurations support 4800 MHz 96 GB RDIMMs.
The DIMM configuration supports 4800 MHz 48 GB RDIMMs.
The DIMM configurations support 5600 MHz 96 GB RDIMMs.
Rank mixing is supported between single-rank and dual-rank RDIMMs, or between quad-rank and octal-rank 3DS RDIMMs when there are 16 DIMMs populated for each processor. See Independent memory mode with mixing ranks for more information on the installation sequence when installing memory modules with different ranks.
Mixing of DDR5 4800 MHz 128 GB and 256 GB 3DS RDIMMs is supported when there are 16 DIMMs populated for each processor.
Total DIMMs | Processor 1 | ||||||||||||||||
16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | ||
2 DIMMs1 | 7 | ||||||||||||||||
4 DIMMs2 | 14 | 7 | |||||||||||||||
8 DIMMs2 | 14 | 10 | 7 | 3 | |||||||||||||
12 DIMMs1,2 | 14 | 12 | 10 | 7 | 3 | 1 | |||||||||||
16 DIMMs1,2,3,4,5 | 16 | 14 | 12 | 10 | 7 | 5 | 3 | 1 | |||||||||
24 DIMMs2,6 | 16 | 14 | 13 | 12 | 10 | 9 | 8 | 7 | 5 | 4 | 3 | 1 | |||||
32 DIMMs2,3,4,6,7,8 | 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 | ||||||||||||||||
4 DIMMs2 | 30 | 23 | |||||||||||||||
8 DIMMs2 | 30 | 26 | 23 | 19 | |||||||||||||
12 DIMMs1,2 | 30 | 28 | 26 | 23 | 19 | 17 | |||||||||||
16 DIMMs1,2,3,4,5 | 32 | 30 | 28 | 26 | 23 | 21 | 19 | 17 | |||||||||
24 DIMMs2,6 | 32 | 30 | 29 | 28 | 26 | 25 | 24 | 23 | 21 | 20 | 19 | 17 | |||||
32 DIMMs2,3,4,6,7,8 | 32 | 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 |
The DIMM configurations support 5600 MHz 24 GB, 48 GB, and 96 GB RDIMMs.
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 support Software Guard Extensions (SGX). See Enable Software Guard Extensions (SGX) to enable this feature.
The DIMM configurations support 4800 MHz 96 GB RDIMMs.
The DIMM configuration supports 4800 MHz 48 GB RDIMMs.
The DIMM configurations support 5600 MHz 96 GB RDIMMs.
Rank mixing is supported between single-rank and dual-rank RDIMMs, or between quad-rank and octal-rank 3DS RDIMMs when there are 16 DIMMs populated for each processor. See Independent memory mode with mixing ranks for more information on the installation sequence when installing memory modules with different ranks.
Mixing of DDR5 4800 MHz 128 GB and 256 GB 3DS RDIMMs is supported when there are 16 DIMMs populated for each processor.
Optional DIMM installation order
The following table shows the optional orders of populating memory modules for independent mode.
Processor | Total DIMMs | Optional installation order |
---|---|---|
Processor 1 | 1 DIMM |
|
2 DIMMs1,2 |
| |
6 DIMMs1 |
| |
12 DIMMs1,3 |
| |
Processors 1 and 2 | 2 DIMMs |
|
4 DIMMs1,2 |
| |
12 DIMMs1 |
| |
24 DIMMs1,3 |
|
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 configuration does not support 5600 MHz 24 GB, 48 GB, and 96 GB RDIMMs.
The DIMM configuration does not support 5600 MHz 24 GB and 48 GB RDIMMs.