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Independent memory mode installation order

In independent memory 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 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.

Independent memory mode guidelines:
  • Populate identical memory capacity and rank per memory channel and processor.
  • Mixing x4/x8, EC4/EC8, 3DS/Non-3DS RDIMM, 4Rank 3DS/8Rank 3DS RDIMM are not allowed in a system.
  • Dual Socket (2P) socket interleaving (NPS0, dual socket system as one NUMA node) can be supported only if:
    1. There is an equal number of populated memory channels per socket and equal number of channels populated in each side of both sockets.
    2. All populated memory channels across both sockets are populated with symmetric memory capacity.
    3. One of the following configurations is used:
      • 12 memory channels populated per socket, 12 channels total.
      • 8 memory channels populated per socket, 16 channels total (Channels ABCEGHIK).
      • 4 memory channels populated per socket, 8 channels total (Channels ACGI).
Note
  • The following notes describe the quantity and capacity of memory modules that must be followed in the SXM5 GPU Model.
    • With H100 GPU installed:
      • For one-processor configuration, select one of the following:
        • Twelve 48 GB DIMMs at 4800 MHz or 6400 MHz
        • Ten or twelve 64 GB DIMMs at 4800 MHz or 6400 MHz
        • Eight, ten, or twelve 96 GB DIMMs at 4800 MHz or 6400 MHz
        • Eight, ten, or twelve 128 GB DIMMs at 4800 MHz, 5600 MHz, or 6400 MHz
      • For two-processor configuration, select one of the following:
        • Sixteen, twenty, or twenty-four 32 GB DIMMs at 4800 MHz or 6400 MHz
        • Sixteen, twenty, or twenty-four 48 GB DIMMs at 4800 MHz or 6400 MHz
        • Sixteen, twenty, or twenty-four 64 GB DIMMs at 4800 MHz or 6400 MHz
        • Sixteen, twenty, or twenty-four 96 GB DIMMs at 4800 MHz or 6400 MHz
        • Sixteen, twenty, or twenty-four 128 GB DIMMs at 4800 MHz, 5600 MHz, or 6400 MHz
    • With H200 GPU installed:
      • For one-processor configuration, select one of the following:
        • Ten or twelve 96 GB DIMMs at 4800 MHz or 6400 MHz
        • Eight, ten, or twelve 128 GB DIMMs at 4800 MHz, 5600 MHz, or 6400 MHz
      • For two-processor configuration, select one of the following:
        • Twenty or twenty-four 48 GB DIMMs at 4800 MHz or 6400 MHz
        • Sixteen, twenty, or twenty-four 64 GB DIMMs at 4800 MHz or 6400 MHz
        • Sixteen, twenty, or twenty-four 96 GB DIMMs at 4800 MHz or 6400 MHz
        • Sixteen, twenty, or twenty-four 128 GB DIMMs at 4800 MHz, 5600 MHz, or 6400 MHz
  • The following notes describe the quantity and capacity of memory modules that must be followed in the Red Hat Enterprise Linux AI configuration.
    • Eight or sixteen 16 GB DIMMs at 4800 MHz or 6400 MHz
    • Four, eight, or sixteen 32 GB DIMMs at 4800 MHz or 6400 MHz
    • Four or eight 64 GB DIMMs at 4800 MHz or 6400 MHz
    • Four or eight ThinkSystem 64GB TruDDR5 6400MHz (2Rx4) RDIMM-A v2 or ThinkSystem 64GB TruDDR5 4800MHz (2Rx4) RDIMM-A
    • Four, eight, or twenty-four ThinkSystem 64GB TruDDR5 6400MHz (2Rx4) 10x4 RDIMM

With one processor​

The following table shows the DIMM population sequence for independent memory mode when one processor is installed.

Table 1. Independent mode memory population sequence for one processor
Total DIMMsProcessor 1
121110987654321
16
2     76     
49764
6   987654   
8119876542
10 111098765432 
12121110987654321

With two processors​

The following tables show the DIMM population sequence for independent memory mode when two processors are installed.

Table 2. Independent mode memory population sequence for two processors
Total DIMMsProcessor 1
121110987654321
26
476
89764
12987654
16119876542
20111098765432
24121110987654321
Total DIMMsProcessor 2
242322212019181716151413
218
41918
821191816
12212019181716
162321201918171614
2023222120191817161514
24242322212019181716151413