DDR5 RDIMM (Registered DIMM) is the standard memory for DDR5 rack servers, tower servers and high-end workstations. This page lists every DDR5 ECC RDIMM NEMIX RAM supplies, at DDR5-4800, DDR5-5600 and DDR5-6400. Each module is a 288-pin, 1.1V registered DIMM: a registering clock driver buffers the command and address signals, which lets a channel carry more capacity and more ranks than unbuffered memory, and side-band ECC on every 32-bit subchannel lets the system detect and correct memory errors. DDR5 has no LRDIMM form factor — the highest capacities are delivered as 3DS RDIMMs.
What is on this page
Single modules from 16GB to 256GB (16GB, 24GB, 32GB, 48GB, 64GB, 96GB, 128GB and 256GB) in 1Rx8, 1Rx4, 2Rx8, 2Rx4 and 3DS 4Rx4 and 8Rx4 organizations, plus matched kits up to 4TB (16x256GB) for fully populated servers. Narrow the list with the Technology Speed, Module Density, Kit and Rank filters. Many listings are matched to a specific server, workstation or motherboard with the system named in the product title, and others are listed by OEM part number — see the Samsung, SK hynix, Micron and Cisco cross-reference pages. Searching your model or part number at the top of the page is the fastest way to find them.
Where DDR5 RDIMM is used
DDR5 RDIMM is commonly paired with Intel Xeon Scalable 4th/5th Gen and Xeon 6, Xeon W-2400/W-3400 workstations, and AMD EPYC 9004/9005, EPYC 8004 and Threadripper PRO and Threadripper 7000/9000 platforms. System-matched listings on this page include Dell PowerEdge 16G and 17G servers such as the R760xs, R7615, R6715, R7725, T560 and C6615, and Dell Precision 5860, 7875 and 7960 workstations; HPE ProLiant Gen11 and Gen12, Cray XD and Alletra storage servers; Lenovo ThinkSystem SR630, SR650, SR655, SR860 and SR950 V3 and SR630 V4, and Lenovo ThinkStation P5, P7 and P8; Cisco UCS C220, C240 and X210c M7 and M8; Supermicro X13, H13, X14 and H14 boards and SuperServers; Gigabyte and ASRock Rack server boards; ASUS Pro WS W790-ACE, W890-SAGE, TRX50-SAGE and WRX90E-SAGE SE workstation boards; and Hypertec and Thinkmate systems.
Choosing the right DDR5 RDIMM
DDR5 RDIMM fits only DDR5 registered slots — it will not seat in DDR4 slots or work in boards built for DDR5 UDIMM. Fill every memory channel for full bandwidth: 8 channels per socket on Xeon Scalable 4th/5th Gen and 12 on EPYC 9004/9005. Use the same density, rank and speed across all channels, and do not mix 3DS with standard RDIMMs, or x4 with x8 modules, unless the platform documentation allows it. A faster module clocks down to the platform's supported speed, and two modules per channel usually runs slower than one. If you are unsure, send us the system model or the OEM part number and we will confirm fitment before you order.
Buying DDR5 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.
