Independent memory mode installation order

Independent memory mode provides the highest level of memory performance, but lacks failover protection. The DIMM installation order for independent memory mode varies based on the number of processors and memory modules installed in the server.

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.
In each memory channel, populate the slot farthest from the processor (slot 0) first.
All memory modules must be DDR5 memory modules.
Mixing 16Gbit (16 GB, 32 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.
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) memory modules.

Table 1. Independent mode
Total DIMMs	Processor 0/1/4/5
Total DIMMs	D1	D2	C1	C2	B1	B2	A1	A2	E2	E1	F2	F1	G2	G1	H2	H1
8 DIMMs							A1
16 DIMMs^*							A1							G1
32 DIMMs^*			C1				A1			E1				G1
48 DIMMs^*	D1		C1				A1			E1		F1		G1
64 DIMMs^*	D1		C1		B1		A1			E1		F1		G1		H1
96 DIMMs^*	D1		C1	C2	B1		A1	A2	E2	E1		F1	G2	G1		H1
128 DIMMs^*	D1	D2	C1	C2	B1	B2	A1	A2	E2	E1	F2	F1	G2	G1	H2	H1
Total DIMMs	Processor 2/3/6/7
Total DIMMs	M1	M2	L1	L2	K1	K2	J1	J2	N2	N1	P2	P1	R2	R1	T2	T1
8 DIMMs							J1
16 DIMMs^*							J1							R1
32 DIMMs^*			L1				J1			N1				R1
48 DIMMs^*	M1		L1				J1			N1		P1		R1
64 DIMMs^*	M1		L1		K1		J1			N1		P1		R1		T1
96 DIMMs^*	M1		L1	L2	K1		J1	J2	N2	N1		P1	R2	R1		T1
128 DIMMs^*	M1	M2	L1	L2	K1	K2	J1	J2	N2	N1	P2	P1	R2	R1	T2	T1

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.

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