SAMSUNG | OEM COMPATIBLE SKU | MEMORY | CROSS-REFERENCE

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NEMIX RAM equivalents matched to Samsung part numbers. If you have an M393, M386, M471 or similar Samsung code and want the same module specification without OEM pricing, this is the page. Every module here is built by NEMIX to the same density, rank, speed and form factor as the Samsung part it references.

Samsung part numbers cross-referenced, spanning M393 registered RDIMM, M386 load-reduced LRDIMM, M391 ECC UDIMM, M378 non-ECC UDIMM, M471 SODIMM and M474 ECC SODIMM. DDR4 with DDR3 for older fleets and DDR5 arriving. Densities 4GB to 256GB, at 1333MHz through 6400MHz.

Samsung's part number encodes the whole specification — M393A4K40DB3-CWE reads as 32GB, DDR4-3200, registered, 2Rx4 — which is why an exact cross-reference is possible rather than an approximation. Search this page by the Samsung code for a direct match.

Need the actual Samsung module instead? Some QVLs, warranties and procurement specs require the original part — see Samsung Original Memory for genuine Samsung inventory.

Lifetime warranty on every module. Purchase orders, net terms and volume pricing for business, government and education buyers.

How to read a Samsung part number

Samsung's format is the same across DDR3, DDR4, and DDR5; only the generation letter and the speed suffix change. Your intro's example, decoded field by field:

M393   A   4   K   40   DB3   -CWE
 |     |   |   |    |    |      |
 |     |   |   |    |    |      └─ speed grade  (CWE = DDR4-3200)
 |     |   |   |    |    └──────── DRAM die revision  (B-, C-, D-, E-, M-, A-die) — not a fitment attribute
 |     |   |   |    └───────────── DRAM width  (40 = x4, 43 = x8)
 |     |   |   └────────────────── die generation code
 |     |   └────────────────────── module capacity  (4 = 32GB)
 |     └────────────────────────── DDR generation  (B = DDR3, A = DDR4, R = DDR5)
 └──────────────────────────────── module type  (M393 = ECC Registered RDIMM)

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

Capacity digit	Module capacity	Width 40 (x4) → typical rank	Width 43 (x8) → typical rank
5	4GB	1Rx4 (DDR3)	1Rx8
1	8GB	1Rx4	1Rx8
2	16GB	1Rx4 (8Gb die) or 2Rx4 (4Gb die)	2Rx8 (8Gb) or 1Rx8 (16Gb)
4	32GB	2Rx4 (8Gb) or 1Rx4 (16Gb)	2Rx8 (16Gb)
8	64GB	2Rx4 (16Gb) or 4Rx4 (8Gb, LRDIMM)	—
A	128GB	2Rx4 (stacked 16Gb) or 4Rx4 LRDIMM	—
B	256GB	8Rx4 3DS LRDIMM	—

Where the same capacity and width appear in two ranks, the die-generation letter and revision decide which — the listing on this page states the rank explicitly, and the server's BMC shows the rank of what is installed. Match that.

Speed suffix	DDR3	Speed suffix	DDR4	Speed suffix	DDR5
-CH9 / -YH9	1333 (1.5V / 1.35V)	-CPB	2133	-CQK	4800
-CK0 / -YK0	1600 (1.5V / 1.35V)	-CRC	2400	-CWM	5600
-CMA / -YMA	1866 (1.5V / 1.35V)	-CTD	2666	-CCP	6400
		-CVF	2933
		-CWE	3200

On DDR3, the first letter of the suffix is voltage: C = 1.5V, Y = 1.35V DDR3L.

Worked examples: M393A2K43BB1-CRC = DDR4-2400, 16GB, 2Rx8 RDIMM. M393A2K40CB2-CTD = DDR4-2666, 16GB, 1Rx4 RDIMM. M393A4K40DB3-CWE = DDR4-3200, 32GB, 2Rx4 RDIMM. M393A8G40AB2-CWE = DDR4-3200, 64GB, 2Rx4 RDIMM. M386A8K40BM2-CTD = DDR4-2666, 64GB, 4Rx4 LRDIMM. M391A2K43BB1-CTD = DDR4-2666, 16GB, 2Rx8 ECC UDIMM. M471A2K43DB1-CWE = DDR4-3200, 16GB, 2Rx8 non-ECC SODIMM. M321R4GA0BB0-CQK = DDR5-4800, 32GB, 2Rx8 RDIMM. M321R8GA0BB0-CQK = DDR5-4800, 64GB, 2Rx4 RDIMM. M393B2G70QH0-YK0 = DDR3-1600, 16GB, 2Rx4 RDIMM, 1.35V.

Why one listing here covers several Samsung numbers

The three characters before the dash are the DRAM die revision — Samsung's B-die, C-die, D-die, E-die, M-die, A-die — and Samsung issues a new one each time it moves a module to newer silicon. The memory controller sees none of it; it sees DDR4, 3200, Registered, 2Rx4, 32GB. So M393A4K40BB1-CWE, M393A4K40CB2-CWE, M393A4K40DB2-CWE, and M393A4K40DB3-CWE are one module to the server. The NEMIX RAM equivalent matches the spec those letters wrap, which is why a single listing carries every Samsung number that resolves to it. The "B-die" reputation that matters on overclocked desktop memory has no bearing on a server module running at JEDEC speed.

Where you will see these numbers

Under an OEM label — Dell, HPE, Lenovo, Cisco, and Supermicro all ship Samsung-built modules. The OEM part number is on top and the M393 / M321 number is printed beneath it or on the DRAM chips. Either finds the equivalent here.
In the BMC / iDRAC / iLO / XCC inventory — a slot reporting manufacturer "Samsung" shows the M393 / M321 number as the part number. Match the body of the number when adding to an existing set.
In a board's QVL — Supermicro's MEM-DR…-SL… revisions are Samsung builds; ASUS, ASRock Rack, and Gigabyte QVLs cite Samsung numbers directly.
In a quote or configurator BOM — resellers frequently quote Samsung numbers rather than OEM ones. Paste the line items into a quote request and we return a matched set.

What "compatible equivalent" means here

A NEMIX RAM module listed against a Samsung number matches it on every attribute the memory controller checks: DDR generation, capacity, ECC, buffering (registered, load-reduced, or unbuffered), rated speed, rank organization and DRAM width, voltage, and pin count. It is built on DRAM from Samsung, SK hynix, or Micron to that specification and tested in the platform class it is listed for before listing. Server firmware reads the SPD, not the maker's part number; a matched module is the same part to the controller. Mixing NEMIX RAM with Samsung modules of the same spec in one system is supported. Every module carries a lifetime replacement warranty with free US-based technical support. Where a procurement spec or warranty term requires the Samsung-branded part itself, your intro links the genuine inventory.

Ordering for fleets

NEMIX RAM is a registered federal supplier (UEI GV8MMYNDJ5J1, CAGE 59AB2) and accepts purchase orders with net terms for business, government, and education buyers. Send a BOM in Samsung numbers with node count, or a BMC inventory export, and we return the full set matched and shipped together. Volume and reseller pricing is available on request.

Frequently asked

My number's die revision isn't on the listing. If prefix, generation letter, capacity digit, width, and speed suffix match, it is the same module; the revision letters are Samsung's die tracking. If the body does not match anything, send us the number and we will match it.

M393A4K40 or M393A4G40 — which 32GB do I want? Both are 32GB RDIMMs at the same speed suffix; K40 is 2Rx4 on 8Gb dies, G40 is 1Rx4 on 16Gb dies. Match the rank the BMC shows for what is installed; if the server is empty, either works and 2Rx4 is the common server build.

M393 vs M386 at the same capacity? M393 is RDIMM, M386 is LRDIMM. They cannot mix in a server. Match what is installed; if the server is empty, RDIMM unless the capacity target needs LRDIMM.

-CVF or -CWE for my 2nd Gen Xeon? -CVF (2933) is what the CPU runs. -CWE (3200) fits and runs at 2933; buy it only if the module will move to a 3200 platform later.

Does "Samsung B-die" matter for server memory? No. B-die's reputation comes from overclocking headroom on desktop UDIMM. Server RDIMMs run at JEDEC speed regardless of die; the revision letters are irrelevant to fitment or performance.