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DDR4-2666 Server Memory
Key takeaways
- 2,259 listings match this collection right now.
- DDR4-2666 modules run at a JEDEC-defined CL19 latency, looser than the tighter timings JEDEC sets for the faster 2933 and 3200 speed grades.
- Single-socket Xeon E3 platforms from this same era topped out at DDR4-2400 unbuffered memory, below the 2666 speed the two-socket registered platforms of the time reached.
- DDR4-2666 modules span capacities from single-rank 8GB and 16GB builds up to quad-rank LRDIMM parts at 64GB and beyond, all sharing this one speed grade.
DDR4-2666 (PC4-21300) is the speed grade of first-generation Xeon Scalable and EPYC Naples platforms. Modules at this grade also run at 2400 in Xeon E5 v4 systems, whose memory controllers top out at DDR4-2400. It is the largest DDR4 speed grade in the catalogue by part count.
2,259 listings in this collection, filtered from Server Memory. The part number and manufacturer are stated on every listing, and the condition wherever the catalogue records one. For quantity, request a volume quote.
How to choose server memory
DDR3, DDR4 and DDR5 modules are keyed differently and do not interchange, so the generation your platform accepts comes first. Registered (RDIMM), load-reduced (LRDIMM) and unbuffered (UDIMM) modules cannot be mixed in one system: add the type already installed, or replace the full bank. Match rank and speed to the existing modules, and read an installed part number from iDRAC or iLO when in doubt.
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