Table 3. Memory Options
Part
number Description
Maximum
supported*
4X70G88318 Lenovo ThinkServer 8GB DDR4-2400MHz (1Rx4) RDIMM 8 / 16
4X70G88319 Lenovo ThinkServer 16GB DDR4-2400MHz (2Rx4) RDIMM 8 / 16
4X70G88320 Lenovo ThinkServer 32GB DDR4-2400MHz (2Rx4) RDIMM 8 / 16
4X70G88321 Lenovo ThinkServer 64GB DDR4-2400MHz (4Rx4) LRDIMM 8 / 16
* Maximum supported with 1 processor installed / 2 processors installed
The server supports up to 8 DIMMs when one processor is installed and up to 16 DIMMs when two processors
are installed. Each processor has four memory channels, and there are two DIMMs supported per channel.
The following table shows the characteristics of the supported DIMMs. All configurations allow the DIMMs to
operate at rated speed, provided the CPU selected also supports that speed. Tables cells highlighted with a
gray background indicate that the server supports higher memory frequencies than the Intel processor
specification.
Table 4. Maximum memory speeds
DIMM specification RDIMM LRDIMM
Rank Single rank Dual rank Quad rank
Part numbers 4X70G88318 (8 GB) 4X70G88319 (16 GB)
4X70G88320 (32 GB)
4X70G88321 (64 GB)
Rated speed 2400 MHz 2400 MHz 2400 MHz
Rated voltage 1.2 V 1.2 V 1.2 V
Maximum quantity supported* 16 16 16
Maximum DIMM capacity 8 GB 32 GB 64 GB
Maximum memory capacity 128 GB 512 GB 1024 GB
Maximum memory at rated speed 64 GB 64 GB 1 TB
Maximum operating speed
1 DIMM per channel 2400 MHz 2400 MHz 2400 MHz
2 DIMMs per channel 2400 MHz 2400 MHz 2400 MHz
* The maximum quantity supported is shown for two processors installed.
Protection against data loss is provided through the following memory RAS features:
ECC
Patrol and Demand Scrubbing
Sparing
Mirroring
Lockstep Mode
Configuration Guidelines
Memory can be configured to meet various needs and workloads subject to the following general rules:
Mixing memory type (RDIMM, LRDIMM) is not supported.
DIMM capacities and rank can be mixed.
When you are populating for the various RAS modes the following rules apply:
If memory mirroring or lockstep is used, DIMMs must be installed in pairs (minimum of one pair per each
CPU), and both DIMMs 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;
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