DDR4 ECC RDIMM MEMORY

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DDR4 RDIMM (Registered DIMM) is the standard memory for DDR4-generation rack servers, tower servers, blade servers and workstations. This page lists every DDR4 ECC RDIMM NEMIX RAM supplies, from DDR4-2133 to DDR4-3200. Each module is a 288-pin, 1.2V registered DIMM: a register buffers the command and address signals, which lets each channel carry more capacity and more ranks than unbuffered memory, and a 72-bit ECC data path (64 data bits plus 8 check bits) lets the system detect and correct memory errors.

What is on this page

Single modules from 8GB to 256GB (8GB, 16GB, 32GB, 64GB, 128GB and 256GB, plus a few 4GB legacy parts) in 1Rx8, 1Rx4, 2Rx8, 2Rx4 and high-capacity 4Rx4 and 8Rx4 organizations, and matched kits up to 4TB (16x256GB) for fully populated servers. DDR4-3200 and DDR4-2933 make up the largest share, with DDR4-2666, 2400 and 2133 for earlier platforms. Narrow the list with the Technology Speed, Module Density, Kit and Rank filters. Many listings are matched to a specific server or board, and many more are listed by OEM part number — Samsung, SK hynix, Micron, Supermicro MEM-DR4, Lenovo 7X77A and 4ZC7A, Cisco UCS-MR, Dell SNP, HPE and IBM parts. Searching your model or part number at the top of the page is the fastest way to find them; see also the Samsung, SK hynix and Micron cross-reference pages.

Where DDR4 RDIMM is used

DDR4 RDIMM is commonly paired with Intel Xeon Scalable 1st, 2nd and 3rd Gen, Xeon E5 v3/v4 and Xeon W, and with AMD EPYC 7001, 7002 and 7003 and Threadripper PRO platforms. System-matched listings on this page include Dell PowerEdge 14G and 15G servers such as the R640, R740xd, R940, T640, R650, R750, R6525, R7525 and C6525, and Dell Precision 5820, 7820 and 7920 workstations; HPE ProLiant Gen10 and Gen10 Plus, including the DL360, DL380, DL385, DL580 and ML350; Cisco UCS M5 and M6 rack and blade servers; Lenovo ThinkSystem servers; Supermicro X12 and H12 boards and systems; ASRock Rack ROMED8, ROME2D and EPYCD8 boards; Gigabyte and Tyan server boards; Synology RackStation and FlashStation and QNAP TS-h enterprise NAS; Apple Mac Pro 2019; IBM systems; and Thinkmate and Hypertec servers.

Choosing the right DDR4 RDIMM

DDR4 RDIMM fits only DDR4 registered slots — it is keyed differently from DDR5 and will not work in boards built for DDR4 UDIMM. Do not mix RDIMM with LRDIMM in the same system, and avoid mixing high-capacity 3DS modules with standard RDIMMs, or x4 with x8 modules, unless the platform documentation allows it. Fill every memory channel for full bandwidth — 6 per socket on Xeon Scalable 1st and 2nd Gen, 8 on 3rd Gen and on EPYC — and use the same density, rank and speed across all of them. A faster module clocks down to the platform's supported speed, so a DDR4-3200 module is a safe replacement for a slower one of the same density and rank. If you are unsure, send us the system model or the OEM part number and we will confirm fitment before you order.

Buying DDR4 server memory direct from NEMIX RAM

NEMIX RAM is a US-based server memory specialist since 1993. Every module is researched, matched and compatibility-tested by NEMIX RAM, JEDEC-compliant, and backed by a lifetime warranty. Purchase orders, net terms and volume pricing are available for business, government and education buyers — request a quote with the part numbers or system models you need, or contact our sales team for fitment help.

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