Lenovo ThinkSystem Dense & HPC Server Memory: SD, SC & SN Nodes

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Memory upgrades for Lenovo ThinkSystem multi-node, Lenovo Neptune direct water-cooled and Flex System compute nodes. Memory is listed per node: every node in a chassis or tray has its own slots and needs its own set of modules. The fastest way to find yours is to type the Lenovo model into the search bar at the top of the page, for example SD650 V2, SD530, SC750 V4 or SN550. The model name is on the front bezel or pull-out label, and the machine type (a four-character code such as 7X06) is on the system label and in Lenovo XClarity.

Intel Xeon 6 (V4)

DDR5-6400 RDIMM: SC750 V4.

DDR5 dense and Neptune nodes (V3)

DDR5 RDIMM: SD650 V3 / SD650-N V3 / SD650-I V3, SD665 V3 / SD665-N V3, SD530 V3, SD535 V3, SD550 V3.

3rd Gen Intel Xeon Scalable (V2)

DDR4-3200 RDIMM: SD630 V2, SD650 V2 / SD650-N V2, SN550 V2.

1st and 2nd Gen Intel Xeon Scalable

DDR4-2933 RDIMM: SD530, SD650, SN550, SN850.

Some water-cooled nodes specify a particular module organization or require every channel to be populated (the SC750 V4 needs 24 identical DIMMs per node); each listing states the rule for its node.

Memory rules across ThinkSystem servers

Match the generation: DDR5 servers (V3 and V4) take only DDR5 RDIMMs; DDR4 servers (V2 and earlier) take only DDR4. The modules are keyed differently and will not seat.
Registered or unbuffered, never both: rack, mission-critical and dense servers take registered memory (RDIMM, 3DS RDIMM or LRDIMM); the Xeon E entry servers (SR250, ST250, ST50, ST45) take ECC unbuffered UDIMMs.
Use one module size and type per server and populate the matched channel groups Lenovo specifies for each processor: six or eight channels per processor on Intel Xeon Scalable, eight or twelve on AMD EPYC.
Each listing names the speeds Lenovo rates for that system; faster modules clock down automatically.

Buying in volume direct from NEMIX RAM

NEMIX RAM is a US-based server memory specialist, in business since 1993. Every module is researched, matched, and compatibility-tested by NEMIX RAM, is JEDEC-compliant, and is backed by a lifetime warranty. Purchase orders, net terms and volume pricing are available for data centers, HPC sites, universities, government buyers and resellers. Request a quote for every node in a cluster, or send us your Lenovo machine type and we will confirm the right module before you order.

More Lenovo memory: all Lenovo server memory · rack servers · tower servers · mission-critical servers · ThinkEdge edge servers · Lenovo OEM part numbers · ThinkStation workstations