Independent memory mode installation order

Follow the rules below when installing memory modules in independent mode:

There should be at least one DDR5 DIMM per processor.
All DDR5 memory modules must operate at the same speed in the same system.
Memory population must be identical between processors.
Memory modules from different vendors are supported.
Note
When ThinkSystem 128GB TruDDR5 4800MHz (4Rx4) 3DS RDIMM v1 and/or ThinkSystem 256GB TruDDR5 4800MHz (8Rx4) 3DS RDIMM v1 is installed in a system, no other memory module types can be installed.
In each memory channel, populate the slot farthest from the processor (slot 0) first.
All memory modules must be DDR5 memory modules.
x8 memory modules and x4 memory modules cannot be mixed in a system.
Mixing 16Gbit (16 GB, 32 GB, 64 GB, 128 GB, 256 GB) and 24Gbit (96 GB) memory module is not allowed in a system.
96 GB memory module must be identically populated in the system and only supported on Intel Xeon Platinum processor.
96 GB memory module can only support 1DPC (8 DIMMs per processor) and 2DPC (16 DIMMs per processor) configurations.
All memory modules to be installed must be of the same type.
- Value RDIMM cannot be mixed with non-value 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.
When ThinkSystem 256GB TruDDR5 4800MHz (8Rx4) 3DS RDIMM v1 is installed in the system, the maximum number of supported drives is twenty-four drives.
Before installing 24Gbit (96 GB) memory module to the system, make sure to update the UEFI firmware to the latest version first, then remove all existing 16Gbit (16 GB, 32 GB, 64 GB, 128 GB, 256 GB) memory modules.

With two processors

The following table shows the sequence of populating memory modules for independent mode when two processors are installed.

Table 1. Independent mode with two processors
Total DIMMs	Processor 1
Total DIMMs	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1
2 DIMMs							10
4 DIMMs^*							10							3
8 DIMMs^*			14				10			7				3
12 DIMMs^*	16		14				10			7		5		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
Total DIMMs	32	31	30	29	28	27	26	25	24	23	22	21	20	19	18	17
2 DIMMs							26
4 DIMMs^*							26							19
8 DIMMs^*			30				26			23				19
12 DIMMs^*	32		30				26			23		21		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

Note

DIMM configurations that 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.

With three processors

The following table shows the sequence of populating memory modules for independent mode when three processors are installed.

Table 2. Independent mode with three processors
Total DIMMs	Processor 1
Total DIMMs	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1
3 DIMMs							10
6 DIMMs^*							10							3
12 DIMMs^*			14				10			7				3
18 DIMMs^*	16		14				10			7		5		3
24 DIMMs^*	16		14		12		10			7		5		3		1
36 DIMMs^*	16		14	13	12		10	9	8	7		5	4	3		1
48 DIMMs^*	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1
Total DIMMs	Processor 2
Total DIMMs	32	31	30	29	28	27	26	25	24	23	22	21	20	19	18	17
3 DIMMs							26
6 DIMMs^*							26							19
12 DIMMs^*			30				26			23				19
18 DIMMs^*	32		30				26			23		21		19
24 DIMMs^*	32		30		28		26			23		21		19		17
36 DIMMs^*	32		30	29	28		26	25	24	23		21	20	19		17
48 DIMMs^*	32	31	30	29	28	27	26	25	24	23	22	21	20	19	18	17
Total DIMMs	Processor 3
Total DIMMs	33	34	35	36	37	38	39	40	41	42	43	44	45	46	47	48
3 DIMMs										42
6 DIMMs^*			35							42
12 DIMMs^*			35				39			42				46
18 DIMMs^*			35		37		39			42				46		48
24 DIMMs^*	33		35		37		39			42		44		46		48
36 DIMMs^*	33		35	36	37		39	40	41	42		44	45	46		48
48 DIMMs^*	33	34	35	36	37	38	39	40	41	42	43	44	45	46	47	48

Note

DIMM configurations that 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.

With four processors

The following table shows the sequence of populating memory modules for independent mode when four processors are installed.

Table 3. Independent mode with four processors
Total DIMMs	Processor 1
Total DIMMs	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1
4 DIMMs							10
8 DIMMs^*							10							3
16 DIMMs^*			14				10			7				3
24 DIMMs^*	16		14				10			7		5		3
32 DIMMs^*	16		14		12		10			7		5		3		1
48 DIMMs^*	16		14	13	12		10	9	8	7		5	4	3		1
64 DIMMs^*	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1
Total DIMMs	Processor 2
Total DIMMs	32	31	30	29	28	27	26	25	24	23	22	21	20	19	18	17
4 DIMMs							26
8 DIMMs^*							26							19
16 DIMMs^*			30				26			23				19
24 DIMMs^*	32		30				26			23		21		19
32 DIMMs^*	32		30		28		26			23		21		19		17
48 DIMMs^*	32		30	29	28		26	25	24	23		21	20	19		17
64 DIMMs^*	32	31	30	29	28	27	26	25	24	23	22	21	20	19	18	17
Total DIMMs	Processor 3
Total DIMMs	33	34	35	36	37	38	39	40	41	42	43	44	45	46	47	48
4 DIMMs										42
8 DIMMs^*			35							42
16 DIMMs^*			35				39			42				46
24 DIMMs^*			35		37		39			42				46		48
32 DIMMs^*	33		35		37		39			42		44		46		48
48 DIMMs^*	33		35	36	37		39	40	41	42		44	45	46		48
64 DIMMs^*	33	34	35	36	37	38	39	40	41	42	43	44	45	46	47	48
Total DIMMs	Processor 4
Total DIMMs	49	50	51	52	53	54	55	56	57	58	59	60	61	62	63	64
4 DIMMs										58
8 DIMMs^*			51							58
16 DIMMs^*			51				55			58				62
24 DIMMs^*			51		53		55			58				62		64
32 DIMMs^*	49		51		53		55			58		60		62		64
48 DIMMs^*	49		51	52	53		55	56	57	58		60	61	62		64
64 DIMMs^*	49	50	51	52	53	54	55	56	57	58	59	60	61	62	63	64

Note

DIMM configurations that 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.

With two processors​

With three processors​

With four processors​

With two processors

With three processors

With four processors