RDIMM DDR4-2666 PC4-21300

This page lists DDR4-2666 PC4-21300 ECC Registered DIMM (RDIMM) — 288-pin, 1.2V, ECC, with a register buffering the command and address lines so servers can populate more slots per channel at full speed. DDR4-2666 runs at 2666MT/s (2666MHz data rate) for 21.3 GB/s of bandwidth per channel.

What is on this page

Single modules from 4GB to 256GB (4GB, 8GB, 16GB, 32GB, 64GB, 128GB and 256GB), in 1Rx4, 1Rx8, 2Rx4, 2Rx8, 4Rx4 and 8Rx4 rank configurations, plus matched kits up to 3TB total. Use the Module Density, Kit and Rank filters to narrow the list, or Shop by System Model to jump straight to modules matched to a specific machine.

Where DDR4-2666 RDIMM is used

DDR4-2666 RDIMM is commonly paired with first-generation Intel Xeon Scalable (Skylake-SP) and AMD EPYC 7001 platforms — Dell PowerEdge 14G, HPE ProLiant Gen10, Cisco UCS M5 and Lenovo ThinkSystem. On this page the system-matched listings cover Dell, Cisco UCS, Synology, Apple Mac Pro and Gigabyte. Every part carries the OEM part number it replaces, so a DDR4-2666 order written against a Dell, HPE, Lenovo, Cisco or Supermicro part number can be matched line for line.

Choosing the right RDIMM module

RDIMM and LRDIMM cannot be mixed in the same system. Within RDIMM, match rank organization (1Rx4, 2Rx4, 2Rx8) to what the platform already runs where possible — mixed ranks are usually supported but can lower the effective speed. A DDR4-2666 module in a platform rated for a slower speed clocks down to the platform's speed; a slower module in a DDR4-2666 platform pulls every channel down to the slower speed. If you are unsure, send us the system model or the OEM part number and we will confirm fitment before you order.

Buying DDR4-2666 RDIMM 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.

Related: all RDIMM memory · RDIMM DDR5-6400 · RDIMM DDR5-5600 · RDIMM DDR5-4800 · RDIMM DDR4-3200 · RDIMM DDR4-2933 · RDIMM DDR4-2400 · RDIMM DDR4-2133 · RDIMM DDR3-1866 · RDIMM DDR3-1600 · RDIMM DDR3-1333.

Also searched as DDR4-2666, DDR4 2666MHz, 2666MT/s, PC4-21300, 288-pin RDIMM, DDR4-2666 ECC Registered.