Cisco UCS Memory by Part Number: UCS-MR & UCS-ML Cross-Reference

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Memory matched to Cisco UCS memory part numbers (PIDs). If you have a UCS-MR, UCS-ML, UCS-MRX or UCSX-MR part number from a Cisco quote, a spec sheet or a module already installed, find it in the tables below: each part number links to the NEMIX RAM module with the same capacity, rank, type and speed. The part number is printed on the module label and listed in the server's memory inventory in Cisco Intersight, UCS Manager or the CIMC.

The cross-reference covers Cisco UCS B-Series blades, C-Series rack servers and X-Series compute nodes from M2 through M8: ECC registered (RDIMM) and load-reduced (LRDIMM) modules, DDR5, DDR4 and DDR3, from 8GB to 256GB per module, at DDR3-1333 through DDR5-6400. Shopping by server model instead? See Cisco UCS memory by server model.

How to read a Cisco memory part number

Type: UCS-MR (and UCS-MRX, UCSX-MR) is a registered RDIMM; UCS-ML is a load-reduced LRDIMM. A server runs one type or the other, never both.
Capacity and rank: the number before G is the capacity, the digit before R is the rank. UCS-MR-X32G2RW is 32GB, 2 rank; UCS-ML-X64G4RT-H is 64GB, 4 rank. On M3 and M4 parts the module count comes first: UCS-MR-1X322RV-A is one 32GB, 2 rank module.
Speed (DDR4 and DDR3): the letter after R. X = DDR3-1333, Y = DDR3-1600, Z = DDR3-1866, U = DDR4-2133, V = DDR4-2400, S = DDR4-2666, T = DDR4-2933, W = DDR4-3200.
Speed (DDR5): read the last two characters together. E1 = DDR5-4800, E3, F3 and G3 = DDR5-5600, E5 = DDR5-6400.
Suffixes such as -A, -G, -H and -C mark the Cisco generation or revision a part was introduced with. They are ordering codes, not electrical differences: the matching module is set by capacity, rank, type and speed.

DDR5 part numbers: M7 and M8

For UCS M7 servers (4th and 5th Gen Xeon Scalable) and M8 servers (Xeon 6, AMD EPYC 9004/9005). DDR5 Cisco parts are registered RDIMMs.

Cisco part number	Capacity	Rank	Type	Speed
UCS-MRX16G1RE3	16GB	1R	RDIMM	DDR5-5600 (PC5-44800)
UCSX-MRX16G1RE1	16GB	1R	RDIMM	DDR5-4800 (PC5-38400)
UCS-MRX32G1RE1	32GB	1R	RDIMM	DDR5-4800 (PC5-38400)
UCS-MRX32G1RE3	32GB	1R	RDIMM	DDR5-5600 (PC5-44800)
UCS-MRX32G1RE5	32GB	1R	RDIMM	DDR5-6400 (PC5-51200)
UCSX-MRX32G1RE1	32GB	1R	RDIMM	DDR5-4800 (PC5-38400)
UCS-MRX48G1RF3	48GB	1R	RDIMM	DDR5-5600 (PC5-44800)
UCS-MRX64G2RE1	64GB	2R	RDIMM	DDR5-4800 (PC5-38400)
UCS-MRX64G2RE3	64GB	2R	RDIMM	DDR5-5600 (PC5-44800)
UCS-MRX64G2RE5	64GB	2R	RDIMM	DDR5-6400 (PC5-51200)
UCSX-MRX64G2RE1	64GB	2R	RDIMM	DDR5-4800 (PC5-38400)
UCS-MRX96G2RF3	96GB	2R	RDIMM	DDR5-5600 (PC5-44800)
UCS-MR128G2RG3 / UCSX-MR128G2RG3	128GB	2R	RDIMM	DDR5-5600 (PC5-44800)
UCS-MR128G4RE1	128GB	4R	RDIMM	DDR5-4800 (PC5-38400)
UCS-MR128G4RE3	128GB	4R	RDIMM	DDR5-5600 (PC5-44800)
UCSX-MR128G4RE1 / UCSX-MR256G8RE1	128GB / 256GB	4R / 8R	RDIMM	DDR5-4800 (PC5-38400)
UCS-MR256G8RE1	256GB	8R	RDIMM	DDR5-4800 (PC5-38400)
UCS-MR256G8RE3	256GB	8R	RDIMM	DDR5-5600 (PC5-44800)

DDR4 part numbers: M5 and M6

S and T parts are for M5 servers (1st and 2nd Gen Xeon Scalable; T, DDR4-2933, needs 2nd Gen). W parts are for M6 servers (3rd Gen Xeon Scalable, AMD EPYC 7003).

Cisco part number	Capacity	Rank	Type	Speed
UCS-MR-X8G1RS-H	8GB	1R	RDIMM	DDR4-2666 (PC4-21300)
UCS-MR-X16G1RS-H	16GB	1R	RDIMM	DDR4-2666 (PC4-21300)
UCS-MR-X16G1RT-H	16GB	1R	RDIMM	DDR4-2933 (PC4-23400)
UCS-MR-X16G1RW	16GB	1R	RDIMM	DDR4-3200 (PC4-25600)
UCS-MR-X16G2RS-H	16GB	2R	RDIMM	DDR4-2666 (PC4-21300)
UCS-MR-X32G2RS-H	32GB	2R	RDIMM	DDR4-2666 (PC4-21300)
UCS-MR-X32G2RT-H	32GB	2R	RDIMM	DDR4-2933 (PC4-23400)
UCS-MR-X32G2RW	32GB	2R	RDIMM	DDR4-3200 (PC4-25600)
UCS-ML-X64G4RS-H	64GB	4R	LRDIMM	DDR4-2666 (PC4-21300)
UCS-ML-X64G4RT-H	64GB	4R	LRDIMM	DDR4-2933 (PC4-23400)
UCS-ML-X64G4RT-H1	64GB	4R	LRDIMM	DDR4-2933 (PC4-23400)
UCS-MR-X64G2RT-H	64GB	2R	RDIMM	DDR4-2933 (PC4-23400)
UCS-MR-X64G2RW	64GB	2R	RDIMM	DDR4-3200 (PC4-25600)
UCS-MR-X64G2RW1	64GB	2R	RDIMM	DDR4-3200 (PC4-25600)
UCS-MR-X64G2RW2	64GB	2R	RDIMM	DDR4-3200 (PC4-25600)
UCS-MR-X64G4RS-H	64GB	4R	RDIMM	DDR4-2666 (PC4-21300)
UCS-ML-128G4RT-H	128GB	4R	LRDIMM	DDR4-2933 (PC4-23400)
UCS-ML-128G4RW	128GB	4R	LRDIMM	DDR4-3200 (PC4-25600)
UCS-ML-128G4RW2	128GB	4R	LRDIMM	DDR4-3200 (PC4-25600)
UCS-MR-128G8RS-H	128GB	8R	RDIMM	DDR4-2666 (PC4-21300)
UCS-ML-256G8RT-H	256GB	8R	LRDIMM	DDR4-2933 (PC4-23400)
UCS-ML-256G8RW	256GB	8R	LRDIMM	DDR4-3200 (PC4-25600)

DDR4 part numbers: M4

For UCS M4 servers (Xeon E5-2600 v3/v4 and E7 v3/v4). V parts, DDR4-2400, need v4 processors.

Cisco part number	Capacity	Rank	Type	Speed
UCS-MR-1X081RV-A	8GB	1R	RDIMM	DDR4-2400 (PC4-19200)
UCS-MR-1X161RV-A	16GB	1R	RDIMM	DDR4-2400 (PC4-19200)
UCS-MR-1X161RV-G	16GB	1R	RDIMM	DDR4-2400 (PC4-19200)
UCS-MR-1X162RU-A	16GB	2R	RDIMM	DDR4-2133 (PC4-17000)
UCS-MR-1X162RU-G	16GB	2R	RDIMM	DDR4-2133 (PC4-17000)
UCS-MR-1X162RV-A	16GB	2R	RDIMM	DDR4-2400 (PC4-19200)
UCS-ML-1X324RU-A	32GB	4R	LRDIMM	DDR4-2133 (PC4-17000)
UCS-ML-1X324RU-G	32GB	4R	LRDIMM	DDR4-2133 (PC4-17000)
UCS-ML-1X324RV-A	32GB	4R	LRDIMM	DDR4-2400 (PC4-19200)
UCS-MR-1X322RU-A	32GB	2R	RDIMM	DDR4-2133 (PC4-17000)
UCS-MR-1X322RU-G	32GB	2R	RDIMM	DDR4-2133 (PC4-17000)
UCS-MR-1X322RV-A	32GB	2R	RDIMM	DDR4-2400 (PC4-19200)
UCS-ML-1X644RU-A	64GB	4R	LRDIMM	DDR4-2133 (PC4-17000)
UCS-ML-1X644RU-G	64GB	4R	LRDIMM	DDR4-2133 (PC4-17000)
UCS-ML-1X644RV-A	64GB	4R	LRDIMM	DDR4-2400 (PC4-19200)
UCS-MR-1X648RU-A	64GB	8R	RDIMM	DDR4-2133 (PC4-17000)

DDR3 part numbers: M2, M3 and M4

For UCS M2 and M3 servers (Xeon 5600, E5-2600 and E5-2600 v2) and DDR3 M4 platforms.

Cisco part number	Capacity	Rank	Type	Speed
UCS-MR-1X162RZ-A	16GB	2R	RDIMM	DDR3-1866 (PC3-14900)
UCS-ML-1X324RY-A	32GB	4R	LRDIMM	DDR3-1600 (PC3-12800)
UCS-ML-1X324RZ-A	32GB	4R	LRDIMM	DDR3-1866 (PC3-14900)
UCS-MR-2X324RX-C	32GB	4R	RDIMM	DDR3-1333 (PC3-10600)

Replacing or adding to installed Cisco memory

Match the part number already installed, or one with the same capacity, rank, type and speed. Do not mix RDIMMs and LRDIMMs, and keep ranks the same across each memory channel.
A faster module runs at the speed the platform supports, but the safest choice is the speed your server is rated for.
Each listing is one module. For a full server or a multi-server order, request a quote with your part list and quantities.

Can't find your part number? Send it to us and we will confirm the matching 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.

More Cisco memory: Cisco UCS memory by server model · DDR5 Cisco memory · DDR4 Cisco memory · Cisco LRDIMM.

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