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DDR4 Cisco UCS Memory: M4, M5 & M6 RDIMM and LRDIMM

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DDR4 memory upgrades for Cisco UCS servers, from M4 through M6: ECC registered (RDIMM) and load-reduced (LRDIMM) modules from 8GB to 256GB, at DDR4-2133 through DDR4-3200. To find yours, type your server model (for example C240 M5) or your Cisco part number (for example UCS-MR-X64G2RW) into the search bar at the top of the page.

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-MR-X32G2RW) 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.

DDR4 Cisco UCS servers

M6 (3rd Gen Xeon Scalable, AMD EPYC 7003), DDR4-3200: B200 M6, C220 M6, C225 M6, C240 M6, C245 M6, X210c M6.
M5 (1st and 2nd Gen Xeon Scalable), DDR4-2933: B200 M5, B480 M5, C220 M5, C240 M5, C480 M5, C480 ML M5, S3260 M5; the AMD EPYC-based C125 M5 uses DDR4-3200.
M4 (Xeon E5-2600 v3/v4, E7 v3/v4), DDR4-2133 and DDR4-2400: by part number, for example UCS-MR-1X322RV-A and UCS-ML-1X644RV-A.

Choosing DDR4 for a Cisco UCS server

RDIMM or LRDIMM: Cisco UCS servers accept either type, but not both in one server. Match the type already installed. LRDIMMs reach the largest capacities (128GB and 256GB modules); see Cisco LRDIMM.
Speed: install the speed your platform is rated for. Faster modules run at the speed the processor supports, so a DDR4-3200 module works in an M5 server at 2933, but M5 servers with 1st Gen Xeon Scalable processors run at up to 2666 and do not take the 64GB RDIMM or the 128GB and 256GB LRDIMMs.
Population: install identical modules and fill memory channels evenly on each processor for full bandwidth.

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 DDR4 memory, Cisco UCS DDR4 RAM, Cisco M5 memory, Cisco M6 memory, UCS-MR-X32G2RW, UCS-MR-X64G2RT-H, Cisco DDR4-3200 RDIMM, Cisco DDR4-2933 RDIMM.