Huawei FusionServer Pro CH225 V5, Technical White Paper

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● 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.
Table 5-3 DDR4 memory specifications
Parameter Specifications
Maximum capacity per
DDR4 DIMM (GB)
384 768 1536 3072
Rated speed (MT/s) 2933 2933 2666 2666
Rank Single rank Dual rank Quad rank Octal rank
Operating voltage (V) 1.2 1.2 1.2 1.2
Maximum number of
DDR4 DIMMs in a node
a
24 24 24 24
Maximum DDR4
memory capacity of the
node (GB)
b
16 32 64 128
Maximum
operating
speed
(MT/s)
1DPC
c
2933
d
2933
d
2666 2666
2DPC 2666 2666 2666 2666
● a: The maximum number of DDR4 DIMMs is based on dual-processor
configuration.
● b: The maximum DDR4 memory capacity varies depending on the processor
type. The value listed in this table is based on the assumption that DIMMs
are fully configured.
● c: DPC (DIMM per channel) indicates the number of DIMMs per channel.
● d: If the Cascade Lake processor is used, the maximum operating speed of a
DIMM can reach 2933 MT/s. If the Skylake processor is used, the maximum
operating speed of a DIMM can reach 2666 MT/s only.
Huawei FusionServer Pro CH225 V5 Compute Node
Technical White Paper 5 Hardware Description
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