ThinkServer engineering tested and validated system designs that support memory speeds beyond Intel’s
original plan, which provides benefits for workloads that require memory speed and density. Lenovo
ThinkServer memory is fully supported up to the rated speeds that are shown in the following table.
Table 4. RD550 maximum memory speeds and capacities
DIMMs per channel RDIMM LR-DIMM
Memory bus speed Maximum capacity Memory bus speed Maximum capacity
1 DPC 2400 MTps 256 GB (8x 32 GB) 2400 MTps 512 GB (8x 64 GB)
2 DPC 2400 MTps 512 GB (16x 32 GB) 2400 MTps 1 TB (16x 64 GB)
3 DPC 1866 MTps 768 GB (24x 32 GB) 2133 MTps 1.5 TB (24x 64 GB)
The following rules apply when the memory configuration is selected:
The server supports RDIMMs and LRDIMMs.
Mixing different types of memory (RDIMMs and LRDIMMs) is not supported.
DIMM capacities and rank can be mixed.
The following memory protection technologies are supported:
ECC
Lockstep (SDDC x4/x8)
Memory mirroring
Memory sparing
Patrol scrubbing
Demand scrubbing
If lockstep or memory mirroring is used, RDIMMs must be installed in pairs (a minimum of one pair per
each processor), and both RDIMMs in a pair must be identical in type, size, and rank.
If memory sparing is used, one rank of a DIMM in each populated channel is reserved as spare memory;
therefore, single-rank DIMMs cannot be used. DIMMs in a pair must be identical in type, size, and rank.
Lockstep, memory mirroring, and memory sparing modes are mutually exclusive. Only one operational
memory mode can be enabled on the server, and it is a system-wide setting.
The following table lists available memory options for the RD550 server.
Table 5. Memory options
Description Part number
Maximum
supported*
RDIMMs
ThinkServer 8GB DDR4-2400MHz (1Rx4) RDIMM 4X70G88318 12 / 24
ThinkServer 16GB DDR4-2400MHz (2Rx4) RDIMM 4X70G88319 12 / 24
ThinkServer 32GB DDR4-2400MHz (2Rx4) RDIMM 4X70G88320 12 / 24
LRDIMMs
ThinkServer 64GB DDR4-2400MHz (4Rx4) LRDIMM 4X70G88321 12 / 24
* The maximum quantity shown is with one processor / two processors.
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