SK hynix Memory Part Number Cross-Reference

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NEMIX RAM modules matched to SK hynix memory part numbers. Each listing names an SK hynix part, such as an HMCG, HMA or HMT 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 SK hynix 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 (HMCG, and HMCT 3DS), plus ECC UDIMM, desktop UDIMM and SODIMM.
DDR4: RDIMM, VLP RDIMM and LRDIMM from 4GB to 256GB at DDR4-2133 to 3200 (HMA, HMAG, HMAT), ECC UDIMM, ECC SODIMM, and desktop and laptop modules.
DDR3: RDIMM, LRDIMM, ECC UDIMM, UDIMM and SODIMM (HMT) for older systems still in service.

Reading an SK hynix part number

The prefix gives the DDR generation, the characters that follow give DRAM density, capacity, module type and DRAM width, and the suffix gives the speed. For example, HMA84GR7CJR4N-XN is a 32GB DDR4-3200 2Rx4 RDIMM, and HMCG94AGBRA is a 64GB DDR5-5600 2Rx4 RDIMM.

Prefix	Generation	Module types on this page
HMT	DDR3	RDIMM, LRDIMM, ECC UDIMM, UDIMM, SODIMM
HMA	DDR4	RDIMM, VLP RDIMM, LRDIMM, ECC UDIMM, UDIMM, ECC SODIMM, SODIMM
HMAG, HMAT	DDR4, later numbering	RDIMM, LRDIMM (HMAT: 128GB and 256GB)
HMCG	DDR5	RDIMM, ECC UDIMM, UDIMM, SODIMM
HMCT	DDR5, 3DS stacked	128GB and 256GB RDIMM

Type code (DDR3, DDR4)	Module
R7	ECC Registered (RDIMM)
R8	ECC Registered, very low profile (VLP RDIMM)
L7	ECC Load-Reduced (LRDIMM)
U7	ECC Unbuffered (ECC UDIMM)
U6	Non-ECC Unbuffered (UDIMM)
S7	ECC SODIMM
S6	Non-ECC SODIMM

DDR4 suffix	Speed	DDR3 suffix	Speed
-TF	DDR4-2133	-G7	DDR3-1066
-UH, -UL	DDR4-2400	-H9	DDR3-1333
-VK, -VN, -VJ	DDR4-2666	-PB	DDR3-1600
-WM, -WR	DDR4-2933	-RD	DDR3-1866
-XN, -XS	DDR4-3200

The full decoder, with capacity codes for DDR4 and DDR5 and example part numbers, is in the SK hynix memory part number guide.

Different revision, same module

The two letters after the type code on DDR4 and DDR3 numbers, such as AF, CJ, DJ or MF, are SK hynix's DRAM die revision, and the digits and N at the end of many DDR5 numbers mark a build variant. 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 capacity code, type, width and speed 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.

Ordering for fleets

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

Frequently asked

HMA84GR7 or HMAA4GR7: which 32GB do I want?
They are not the same module. HMA84GR7…R4 is 32GB 2Rx4 on 8Gb DRAM; HMAA4GR7…R4 is 32GB 1Rx4 on 16Gb DRAM, and HMAA4GR7…R8 is 32GB 2Rx8. When adding to a populated server, match the rank and width shown for the installed modules in the BMC.

R7 or L7 at the same capacity?
R7 is RDIMM and L7 is LRDIMM. They cannot be mixed in one server, so match what is installed.

U7 or U6, S7 or S6?
7 is ECC and 6 is non-ECC. A server or workstation board that requires ECC UDIMM or ECC SODIMM needs the 7; a desktop or laptop takes the 6.

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