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Cisco UCS LRDIMM: Load-Reduced Server Memory

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Load-reduced (LRDIMM) memory for Cisco UCS servers: the module type that reaches the largest capacities, up to 256GB per module, on DDR4 and DDR3 Cisco platforms from M3 through M6. To find yours, type your server model (for example C240 M5) or your Cisco part number (for example UCS-ML-128G4RW) into the search bar at the top of the page. Cisco load-reduced part numbers start with UCS-ML.

This collection holds two kinds of listings. Server listings (titled "Cisco UCS" + model) are matched to one UCS model and offer every supported size in single modules and matched kits. Part-number listings (titled with a Cisco PID such as UCS-ML-X64G4RT-H) are matched to one Cisco memory part number: use them when you are replacing or adding to modules you already have, or ordering from a Cisco quote.

Cisco UCS servers with LRDIMM listings

M6, DDR4-3200, 64GB to 256GB: B200 M6, C220 M6, C225 M6, C240 M6, C245 M6, X210c M6.
M5, DDR4-2933, 64GB to 256GB: B200 M5, B480 M5, C220 M5, C240 M5, C480 M5, C480 ML M5, S3260 M5; C125 M5 at DDR4-3200.
M4 and M3, DDR4-2133/2400 and DDR3: by part number, for example UCS-ML-1X644RU-A and UCS-ML-1X324RZ-A.

LRDIMM or RDIMM?

Do not mix: a Cisco UCS server runs either LRDIMMs or RDIMMs, never both. Match the type already installed; if your server has registered modules (UCS-MR parts), see DDR4 Cisco memory.
When to choose LRDIMM: for the highest total capacity, using 128GB and 256GB modules. On M5 servers these need 2nd Gen Xeon Scalable processors.
DDR5 servers: Cisco UCS M7 and M8 servers use DDR5 RDIMMs; see DDR5 Cisco memory.

Not sure which module fits? Send us your Cisco UCS model or part number and we will confirm the right module before you order.

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, enterprise IT, service providers, research labs, universities, government buyers and resellers. Request a quote for a UCS domain refresh, a full chassis or multiple identical servers.

More Cisco memory: Cisco UCS memory by server model · DDR5 Cisco memory · DDR4 Cisco memory · Cisco LRDIMM · Cisco OEM part numbers (UCS-MR, UCS-ML).

Also searched as: Cisco LRDIMM, Cisco load reduced memory, UCS-ML memory, UCS-ML-128G4RW, UCS-ML-256G8RT-H, Cisco 128GB LRDIMM, Cisco 256GB LRDIMM.