Table 70. Memory channels
Processor Channel
A
Channel
B
Channel C Channel D Channel E Channel F Channel G Channel H
Processor 1 Slots A1
and A9
Slots A7
and A15
Slots A3
and A11
Slots A5
and A13
Slots A4 and
A12
Slots A6
and A14
Slots A2 and
A10
Slots A8 and
A16
Processor
2
Slots B1
and B9
Slots B7
and B15
Slots B3
and B11
Slots B5
and B13
Slots B4 and
B12
Slots B6
and B14
Slots B2 and
B10
Slots B8 and
B16
Table 71. Supported memory matrix
DIMM type Rank Capacity DIMM rated
voltage and
speed
Operating Speed
1 DIMM per
channel (DPC)
2 DIMMs per
channel (DPC)
RDIMM 1 R 16 GB DDR5 (1.1 V), 4800
MT/s
4800 MT/s 4400 MT/s
2 R 32 GB, 64 GB DDR5 (1.1 V), 4800
MT/s
4800 MT/s 4400 MT/s
4 R 128 GB DDR5 (1.1 V), 4800
MT/s
4800 MT/s 4400 MT/s
8 R 256 GB DDR5 (1.1 V), 4800
MT/s
4800 MT/s 4400 MT/s
General memory module installation guidelines
To ensure optimal performance of your system, observe the following general guidelines when configuring your system memory.
If your system's memory configuration fails to observe these guidelines, your system might not boot, stop responding during
memory configuration, or operate with reduced memory.
The memory bus may operate at speeds of 4800 MT/s, 4400 MT/s or 4000 MT/s depending on the following factors:
● System profile selected (for example, Performance, Performance Per Watt Optimized (OS), or Custom [can be run at high
speed or lower])
● Maximum supported DIMM speed of the processors
● Maximum supported speed of the DIMMs
NOTE: MT/s indicates DIMM speed in MegaTransfers per second.
NOTE: Fault Resilient Memory supports only eight and sixteen DIMMs per processor.
● All DIMMs must be DDR5.
● Memory mixing is not supported for:
○ Different DIMM capacities
○ X4 and X8 DRAM memory modules
○ 3DS and non-3DS RDIMMs
NOTE:
3DS is a DRAM technology used to manufacture the highest capacity DIMMs. Refer to your DIMM
documentation for additional details.
● If memory modules with different speeds are installed, they operate at the speed of the slowest installed memory module(s).
● Populate memory module sockets only if a processor is installed.
○ For single-processor systems, sockets A1 to A16 are available.
○ For dual-processor systems, sockets A1 to A16 and sockets B1 to B16 are available.
○ A minimum of 1 DIMM must be populated for each installed processor.
● In Optimizer Mode, the DRAM controllers operate independently in the 64-bit mode and provide optimized memory
performance.
96
Installing and removing system components
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