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Lenovo ThinkSystem Tower Server Memory: ST650, ST550, ST250 & ST50

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Memory upgrades for Lenovo ThinkSystem tower servers, from the single-socket ST50 and ST250 to the two-socket ST550 and ST650. Each listing covers one server model and generation, using the memory type, speed and module sizes Lenovo specifies for it. The fastest way to find yours is to type the Lenovo model into the search bar at the top of the page, for example ST250 V2, ST50, ST650 V3 or ST550. 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.

Two-socket towers

RDIMM: ST650 V3, ST650 V2, ST550.

Single-socket towers, Intel Xeon E and AMD EPYC 4004

ECC UDIMM: ST250 V3, ST250 V2, ST250, ST50 V3, ST50 V2, ST50, ST45 V3.

The two-socket towers take registered memory (RDIMM); the single-socket towers take ECC unbuffered UDIMMs only. The SR250 V3 and ST250 V3 share one listing because their memory is identical.

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 entry servers (SR250, ST250 and ST50 on Intel Xeon E, ST45 V3 on AMD EPYC 4004) 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 a fleet of branch-office servers, 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 · mission-critical servers · dense and HPC servers · ThinkEdge edge servers · Lenovo OEM part numbers · ThinkStation workstations