Samsung Memory Part Number Cross-Reference

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NEMIX RAM modules matched to Samsung memory part numbers. Each listing names one Samsung part, such as an M321R, M393, M386 or M474 number, and the NEMIX RAM module that matches it on generation, capacity, rank and width, speed, voltage and form factor. Every module is researched, matched, and compatibility-tested by NEMIX RAM, a US-based server memory specialist since 1993, and backed by a lifetime warranty. Type your Samsung number into the search bar at the top of the page to go straight to it.

What is on this page

DDR5: RDIMM at DDR5-4800, 5600 and 6400 from 16GB to 256GB (M321R, M329R), ECC UDIMM (M324R), ECC SODIMM (M426R), and desktop and laptop modules (M323R, M425R).
DDR4: RDIMM, VLP RDIMM and LRDIMM from 4GB to 256GB at DDR4-2133 to 3200 (M393A, M392A, M386A), ECC UDIMM (M391A), ECC SODIMM (M474A), and desktop and laptop modules (M378A, M471A).
DDR3: RDIMM, LRDIMM, ECC UDIMM and SODIMM for older systems still in service.

Reading a Samsung part number

The prefix gives the module type and DDR generation, the code that follows gives capacity and organization, and the suffix after the dash gives the speed. For example, M393A4K40DB3-CWE is a 32GB DDR4-3200 2Rx4 RDIMM, and M321R8GA0PB0-CWM is a 64GB DDR5-5600 2Rx4 RDIMM.

Module type	Typical use	DDR3	DDR4	DDR5
ECC Registered (RDIMM)	rack and tower servers, workstations	M393B	M393A	M321R, M329R
ECC Registered, very low profile (VLP RDIMM)	blades and dense 1U systems	M392B	M392A	—
ECC Load-Reduced (LRDIMM)	high-capacity servers	M386B	M386A	— (DDR5 has no LRDIMM)
ECC Unbuffered (ECC UDIMM)	entry servers, workstations	M391B	M391A	M324R
Non-ECC Unbuffered (UDIMM)	desktops	M378B	M378A	M323R
ECC SODIMM	NAS, edge servers, compact systems	M474B	M474A	M426R
Non-ECC SODIMM	laptops, mini PCs	M471B	M471A	M425R

DDR5 suffix	Speed	DDR4 suffix	Speed	DDR3 suffix	Speed
-CQK, -CWK (3DS)	DDR5-4800	-CPB, -CRB	DDR4-2133	-CH9 / -YH9	DDR3-1333
-CWM	DDR5-5600	-CRC, -CTC, -CUC	DDR4-2400	-CK0 / -YK0	DDR3-1600
-CCP	DDR5-6400	-CTD, -CWD	DDR4-2666	-CMA / -YMA	DDR3-1866
		-CVF, -CYF (3DS)	DDR4-2933
		-CWE, -CAE (3DS)	DDR4-3200

The full decoder, with every capacity code and example part numbers, is in the Samsung memory part number guide.

Different revision, same module

The letters and digits just before the dash, such as DB3, EB2 or PB0, are Samsung's DRAM die and board revision. The server does not see them: it reads generation, capacity, rank, width and speed. If your exact revision is not listed, a listing with the same prefix, capacity code and speed suffix is the same module to the system. If you are unsure, send us the part number and we will confirm the match before you order.

Need the Samsung module itself?

Some qualified vendor lists, warranty terms and procurement specifications call for the Samsung-branded part. For those, see Samsung Original memory modules, available on request for a quote.

Ordering for fleets

Purchase orders, net terms and volume pricing are available for business, government and education buyers. Send a bill of materials in Samsung part numbers, or a BMC memory inventory export, and we will return a matched set shipped together. Request a quote.

Frequently asked

M393A4K40 or M393A4G40: which 32GB do I want?
Both are 32GB DDR4 RDIMMs. K40 is 2Rx4 and G40 is 1Rx4 on newer, higher-density DRAM. When adding to a populated server, match the rank shown for the installed modules in the BMC; in an empty server either works.

M393 or M386 at the same capacity?
M393 is RDIMM and M386 is LRDIMM. They cannot be mixed in one server, so match what is installed.

-CVF or -CWE for a 2nd Gen Xeon Scalable server?
The processor runs memory at up to DDR4-2933, which is -CVF. A -CWE (DDR4-3200) module also fits and runs at 2933.

Can I mix NEMIX RAM and Samsung modules?
Matching specification is what matters: install modules of the same generation, type, capacity, rank and speed together, and populate channels evenly.