Observe the following rules when you need to use different types of memory modules in
a compute node:
–
RDIMMs and LRDIMMs cannot be used together.
–
Do not use 128 GB memory modules together with memory modules of other
capacities.
–
If memory modules with different rank quantities need to be installed in the same
channel, install the memory modules with more ranks in slots farther away from the
CPU.
For example, install the dual-rank memory module in slot 1A1 and the single-rank
memory module in slot 1A2.
–
Memory modules of different speeds can be mixed in any way. However, the
memory speed is the lowest speed of the memory modules 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 memory modules are used together.
Table 2-3
DDR4 memory specifications
Parameter
Specifications
Rank
Single rank
Dual rank
Quad rank
Octal rank
Rated speed (MT/s)
2933
a
2933
a
2666
2666
Operating voltage (V)
1.2
1.2
1.2
1.2
Maximum number of DDR4
memory modules in a node
b
24
24
24
24
c
Maximum capacity per
DDR4 memory module
(GB)
16
32
64
128
Maximum DDR4 memory
capacity of the node (GB)
384
768
1536
3072
c
Maximum
operating
speed
(MT/s)
One DDR4
memory
module per
channel
2933
a
2933
a
2666
2666
Two DDR4
memory
modules per
channel
2666
2666
2666
2666
FusionServer Pro CH121 V5 Compute Node
User Guide
2 Hardware Description
Issue 06 (2019-08-10)
Copyright © Huawei Technologies Co., Ltd.
14
