5.1.4.1.3 Memory Compatibility
Observe the following rules when configuring DDR4 memory modules:
⚫
A server must use DDR4 memory modules of the same part number (P/N code), and the
memory speed is the minimum value of the following items:
⚫
Memory speed supported by a CPU
⚫
Maximum operating speed of a memory module
⚫
The DDR4 DIMMs of different types (RDIMM and LRDIMM) and specifications
(capacity, bit width, rank, and height) cannot be used together.
⚫
Contact your local sales representative or see "Search Parts" in the Compatibility Checker
to determine the components to be used.
⚫
The memory can be used with the third-generation Intel
®
Xeon
®
Scalable Ice Lake
processors. The maximum memory capacity supported by all processor models is the
same.
⚫
The total memory capacity is the sum of the capacity of all DDR4 DIMMs.
The total memory capacity refers to the capacity when DDR4 memory modules are fully
configured. For details about the memory capacity when PMem modules are used together
with DDR4 memory modules, see 5.1.4.2.3 Memory Compatibility.
⚫
For details about the capacity type of a single memory module, see "Search Parts" in the
Compatibility Checker.
⚫
The maximum number of memory modules supported depends on the memory type and
rank quantity.
Each memory channel supports a maximum of 8 ranks. The number of memory modules supported by
each channel varies depending on the number of ranks supported by each channel:
Number of memory modules supported by each channel ≤ Number of ranks supported by each memory
channel/Number of ranks supported by each memory module
⚫
A memory channel supports more than eight ranks for LRDIMMs.
A quad-rank LRDIMM generates the same electrical load as a single-rank RDIMM on a memory bus.
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