A quad-rank LRDIMM generates the same electrical load as a single-rank RDIMM on a
memory bus.
Table 5-7 DDR4 memory specifications
Parameter
Specifications
Maximum capacity per DDR4 memory module (GB)
128
Rated speed (MT/s)
2933
Operating voltage (V)
1.2
Maximum number of DDR4 memory modules in a
server
a
48
Maximum DDR4 memory capacity of the server
(GB)
b
6144
Maximum operating
speed (MT/s)
1DPC
c
2933
d
2DPC
2666
● a: The maximum number of DDR4 memory modules is based on four-
processor configuration. The value is halved for a server with two processors.
● b: The maximum DDR4 memory capacity varies depending on the processor
type. The value listed in this table is based on the assumption that memory
modules 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
memory module can reach 2933 MT/s. If the Skylake processor is used, the
maximum operating speed of a memory module can reach 2666 MT/s only.
5.4.4 Memory Installation Guidelines
●
Observe the following when configuring DDR4 memory modules:
–
Install memory modules only when corresponding processors are
installed.
–
Do not install LRDIMMs and RDIMMs in the same server.
–
Install filler memory modules in vacant slots.
●
Observe the following when configuring DDR4 memory modules in specific
operating mode:
–
Memory sparing mode
▪
Comply with the general installation guidelines.
▪
Each memory channel must have a valid online spare configuration.
▪
The channels can have different online spare configurations.
Huawei FusionServer Pro 2488H V5 Server
Technical White Paper
5 Hardware Description
Issue 03 (2020-04-20)
Copyright © Huawei Technologies Co., Ltd.
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