Huawei FusionServer Pro CH242 V5 Technical White Paper page 24

Huawei FusionServer Pro CH242 V5 Compute Node
Technical White Paper
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Issue 07 (2020-07-31)
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Other processors: 768 GB/socket
– Cascade Lake processors
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L processors: 4.5 TB/socket
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M processors: 2 TB/socket
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Other processors: 1 TB/socket
The total memory capacity is the sum of the capacity of all DDR4 DIMMs.
NO TICE
The total memory capacity cannot exceed the maximum memory capacity
supported by the CPUs.
Use the Intelligent Computing Compatibility Checker
capacity type of a single DIMM.
The maximum number of DIMMs supported by a server varies depending on
the CPU type, memory type, rank quantity, and operating voltage.
NO TE
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.
NO TE
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.
– Do not use 128 GB DIMMs together with DIMMs of other capacities.
– If DIMMs with different rank quantities need to be installed in the same
channel, install the DIMMs with more ranks in slots farther away from
the CPU.
For example, install the dual-rank DIMM in slot 1A1 and the single-rank
DIMM in slot 1A2.
– Memory modules of different speeds can be mixed in any way. However,
the memory speed is the lowest speed of the DIMMs configured.
– RAS features, such as memory mirroring, single device data correction
(SDDC), SDDC+1, and double device data correction (DDDC), are not
supported if x4 and x8 DIMMs are used together.
Copyright © Huawei Technologies Co., Ltd.
5 Hardware Description
to determine the
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