Dimm Installation Rules - xFusion Digital Technologies FusionServer CH242 V5 Manual

FusionServer CH242 V5 Compute Node
Technical White Paper
Table 5-3 DDR4 memory specifications
Parameter
Maximum capacity per
DDR4 DIMM (GB)
Rated speed (MT/s)
Rank
Operating voltage (V)
Maximum number of DDR4
DIMMs in a node
Maximum DDR4 memory
capacity of the node (GB)
Maximum
operating
speed
(MT/s)
⚫
⚫
⚫
⚫
⚫

5.3.1.4 DIMM Installation Rules

⚫
2022-08-12
− 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.
a
c
1DPC
2DPC
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 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. Different CPUs possess different specifications, For
details about the CPU parameters, see the Intel official website.
The information listed in this table is for reference only. For details, consult the local
sales representative.
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.
DIMM
16 32
2933 2933
Single rank Dual rank
1.2 1.2
48 48
768 1536
b
d
2933 2933
2666 2666
5 Hardware Description
64
2666
Quad rank
1.2
48
3072
d
2666
2666
128
2666
Octal rank
1.2
48
6144
2666
2666
22