FusionServer CH242 V5 Compute Node
Technical White Paper
5 Hardware Description
2022-08-12
21
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A server must use the same model of DDR4 DIMMs, and all the DIMMs operate at the
same speed, which is the smallest value of:
⚫
Memory speed supported by a processor
⚫
Maximum operating speed of a memory module
⚫
The DDR4 memory modules of different types (RDIMM and LRDIMM) cannot be used
together.
⚫
Contact your local sales representative or use the
components to be used.
⚫
The memory can be used with Intel
®
Xeon
®
Scalable Skylake and Cascade Lake
processors. The maximum memory capacity supported varies depending on the
processor model.
−
Skylake processors
◼
M processors: 1.5 TB/socket
◼
Other processors: 768 GB/socket
−
Cascade Lake processors
◼
L processors: 4.5 TB/socket
◼
M processors: 2 TB/socket
◼
Other processors: 1 TB/socket
⚫
The total memory capacity is the sum of the capacity of all DDR4 DIMMs.
The total memory capacity cannot exceed the maximum memory capacity supported by the
CPUs.
⚫
to determine the capacity type of a single memory
module.
⚫
The maximum number of DIMMs supported by a server varies depending on the CPU
type, memory type, rank quantity, and operating voltage.
Each memory channel supports a maximum of 8 ranks. The number of DIMMs supported by each
channel varies depending on the number of ranks supported by each channel:
Number of DIMMs supported by each channel ≤ Number of ranks supported by each memory
channel/Number of ranks supported by each DIMM
⚫
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.
⚫
DDR4 DIMMs of different specifications (capacity, bit width, rank, and height) can be
used together for capacity expansion purposes. However, the memory Reliability,
Availability, and Serviceability (RAS) features may be affected.
Observe the following rules when you need to use different types of DIMMs in a
compute node:
−
RDIMMs and LRDIMMs cannot be used together.
