SK HYNIX | OEM COMPATIBLE SKU | MEMORY | CROSS-REFERENCE

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Memory matched to SK Hynix part numbers. If you have an HMA, HMT or HMC code — off a module label, a server's memory report, or a quote — this is where you find the compatible equivalent at a fraction of the OEM price.

The cross-reference covers All SK Hynix part numbers across all six module types: registered RDIMM and load-reduced LRDIMM for servers, ECC and non-ECC UDIMM for workstations and desktops, and SODIMM and ECC SODIMM for laptops, NAS and edge systems. Densities run 4GB to 256GB, in every rank configuration from 1Rx16 to 8Rx4.

SK Hynix encodes the whole specification into the part number, and knowing how to read it saves an expensive mistake. The prefix gives the generation — HMT is DDR3, HMA is DDR4, HMC is DDR5. The middle carries density and organisation. And the module type sits in the tail: GR7 is registered RDIMM, GL7 is load-reduced LRDIMM — one character apart, and not interchangeable in any server.

Search this page by part number for an exact match, or send us the list and we'll quote the set. Lifetime warranty on every module. Purchase orders, net terms and volume pricing for business, government and education buyers.

How to read an SK hynix part number

SK hynix numbers are the most information-dense in the industry, and the DDR4 format is the one most of the fleet still runs. Once you can read it, the equivalent on this page is obvious — and so is why several hynix numbers land on one listing.

DDR4:   HMA   8   4G   R7   CJ   R4   N   -XN
         |    |    |    |    |    |    |    |
         |    |    |    |    |    |    |    └─ speed grade  (XN = DDR4-3200)
         |    |    |    |    |    |    └────── lead-free / halogen-free flag
         |    |    |    |    |    └─────────── DRAM width  (R4 = x4 chips, R8 = x8 chips)
         |    |    |    |    └──────────────── die revision  (AF, CJ, MF, JJ …) — not a fitment attribute
         |    |    |    └───────────────────── module type  (R7 = Registered ECC)
         |    |    └────────────────────────── module capacity  (4G = 32GB)
         |    └─────────────────────────────── DRAM die density  (8 = 8Gb, A = 16Gb, 4 = 4Gb)
         └──────────────────────────────────── generation  (HMA = DDR4)

Field	Codes	Meaning
Generation	HMT · HMA · HMC / HMCG	DDR3 · DDR4 · DDR5
Die density (DDR4)	4 · 8 · A · B	4Gb · 8Gb · 16Gb · 16Gb 3DS stack. Two numbers with the same capacity and different density letters (HMA84GR7 vs HMAA4GR7, both 32GB) are the same spec built on different dies; the board does not distinguish them.
Capacity (DDR4)	51 · 1G · 2G · 4G · 8G · AG	4GB · 8GB · 16GB · 32GB · 64GB · 128GB
Module type	R7 · L7 · U7 · U6 · S7 · S6	Registered ECC RDIMM · Load-Reduced ECC LRDIMM · ECC UDIMM · non-ECC UDIMM · ECC SODIMM · non-ECC SODIMM. The digit is the ECC flag: 7 = 72-bit (ECC), 6 = 64-bit (non-ECC).
DRAM width	R4 · R8 · R16	x4 · x8 · x16 chips. With capacity and die density this fixes the rank: HMA82GR7…R4 is 16GB 1Rx4; HMA82GR7…R8 is 16GB 2Rx8.
Speed grade (DDR4)	-TF · -UH · -VK · -WM · -XN	DDR4-2133 · 2400 · 2666 · 2933 · 3200
Speed grade (DDR3)	-G7 · -H9 · -PB · -RD	DDR3-1066 · 1333 · 1600 · 1866. An A before the dash (HMT351R7CFR4A-PB) is 1.35V DDR3L; C is 1.5V.

Worked examples: HMA82GR7CJR8N-XN = DDR4-3200, 16GB, 2Rx8 ECC RDIMM. HMA84GR7CJR4N-WM = DDR4-2933, 32GB, 2Rx4 ECC RDIMM. HMAA8GR7AJR4N-XN = DDR4-3200, 64GB, 2Rx4 ECC RDIMM on 16Gb dies. HMAA4GU7AJR8N-XN = DDR4-3200, 32GB, 2Rx8 ECC UDIMM. HMA81GS6CJR8N-VK = DDR4-2666, 8GB, 1Rx8 non-ECC SODIMM. HMABAGL7ABR4N-XN = DDR4-3200, 128GB, 4Rx4 LRDIMM. HMT42GR7AFR4C-PB = DDR3-1600, 16GB, 2Rx4 ECC RDIMM, 1.5V.

DDR5 numbers

SK hynix changed the layout for DDR5, and the capacity codes moved. The prefix is HMCG; the two digits after it identify capacity and organization; the type letter sits later in the string; the numeric tail carries the speed grade.

DDR5 code	Module	Example
HMCG78	16GB 1Rx8	HMCG78MEBRA… (RDIMM) · HMCG78AGBSA… (SODIMM)
HMCG88	32GB 2Rx8	HMCG88MEBRA… (RDIMM) · HMCG88AGBUA… (UDIMM) · HMCG88AGBSA… (SODIMM)
HMCG84	32GB 1Rx4	HMCG84MEBRA… (RDIMM)
HMCG94	64GB 2Rx4	HMCG94MEBRA… (RDIMM)
HMCGM4	128GB 2Rx4 (3DS)	HMCGM4MEBRA… (RDIMM)

In the DDR5 string, R = Registered, U = Unbuffered, S = SODIMM, and the three-digit number before the final letter tracks the speed grade (4800, 5600, and 6400 parts carry different codes). The letters between capacity and type (MEB, AGB, AEB) are die and PCB revisions, the same role as AF/CJ/MF on DDR4. Match the capacity code, type letter, and speed; ignore the revision letters.

Why one listing here covers several hynix numbers

SK hynix issues a new die-revision code (AF → CJ → MF → JJ) every time it moves a module to a newer DRAM, and a new density letter when it builds the same capacity on a larger die. The memory controller sees none of it — it sees DDR4, 3200, Registered, 2Rx8, 16GB — so HMA82GR7AFR8N-XN, HMA82GR7CJR8N-XN, HMA82GR7JJR8N-XN, and HMA82GR7DJR8N-XN are one module to the server. The NEMIX RAM equivalent matches the spec those letters wrap, which is why a single listing carries every hynix number that resolves to it.

Where you will see these numbers

On the module label — every SK hynix module carries the full HMA / HMT / HMC number, and it is often printed underneath an OEM label as well: the Dell SNP, HPE, Lenovo FRU, or Cisco PID on top and the hynix number beneath. Either finds the equivalent here.
In the BMC / iDRAC / iLO / XCC inventory — a slot reporting manufacturer "SK Hynix" or "Hynix" shows the HMA number as the part number. That is what to match when adding to an existing set.
In a board's QVL — Supermicro, ASUS, ASRock Rack, and Gigabyte tested-memory lists cite hynix numbers directly. Any HMA / HMC part on a QVL has an equivalent here.
In a quote or configurator BOM — resellers frequently quote hynix 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 an SK hynix 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 SK hynix, Samsung, 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 hynix modules of the same spec in one system is supported. Every module carries a lifetime replacement warranty with free US-based technical support.

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 hynix 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 revision letters aren't on the listing. If generation, capacity, type, width, and speed match, it is the same module; the revision letters are hynix's die tracking. If the body does not match anything, send us the number and we will match it.

HMA84GR7 or HMAA4GR7 — which 32GB do I want? Either; both are 32GB 2Rx4 RDIMMs on the same speed grade, built on 8Gb and 16Gb dies respectively. Match speed and rank to what is installed and the die density does not matter.

R7 vs L7 at the same capacity? R7 is RDIMM, L7 is LRDIMM. They cannot mix in a server. Match the type letter to what is installed; if the server is empty, RDIMM unless the capacity target needs LRDIMM.

U7 vs U6, S7 vs S6? 7 is ECC, 6 is non-ECC. A server or workstation board specifying ECC UDIMM wants the 7; a desktop or laptop wants the 6, and will run a 7 as non-ECC at best.

The suffix on my module is -VK but the server is 2933-capable. -VK is DDR4-2666 and will run at 2666. Buy -WM (2933) or -XN (3200) if the platform and CPU support it; the faster part is backward-compatible and runs at the platform's speed.