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Table 47. Supported memory matrix (continued)
DIMM type
Rank
2 R
4 R
8 R
NOTE:
The processor may reduce the performance of the rated DIMM speed.
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.
● Modes supported in Xeon Max processor:
○ Xeon Max only without DIMMs
○ Cache with DIMMs
● Supported RDIMM configurations per Xeon Max processor:
○ 0 DIMM (Xeon Max only mode)
○ 4 DIMMs (cache)
○ 8 DIMMs (cache)
○ 16 DIMMs (cache)
● DDR5/Xeon Max memory ratio must be in the range of 2:1 ~ 64:1 for cache mode
NOTE:
Each Xeon Max processor has 64 GB integrated memory.
● 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.
Capacity
DIMM rated
voltage and
speed
32 GB, 64 GB
DDR5 (1.1 V), 4800
MT/s
128 GB
DDR5 (1.1 V), 4800
MT/s
256 GB
DDR5 (1.1 V), 4800
MT/s
Operating Speed
1 DIMM per
channel (DPC)
4800 MT/s
4800 MT/s
4800 MT/s
Installing and removing system components
2 DIMMs per
channel (DPC)
4400 MT/s
4400 MT/s
4400 MT/s
97
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