Dell PowerEdge R940 — supported memory

4-socket 3U rack server. Up to four Intel Xeon Scalable processors, 1st Gen (Skylake-SP) and 2nd Gen (Cascade Lake-SP), up to 28 cores per socket. 48 DDR4 DIMM slots total, 12 per CPU. 6 memory channels per CPU, 2 DIMMs per channel (2 DPC; 3 DPC not supported). Registered ECC DDR4 only: RDIMM and LRDIMM (incl. 3DS LRDIMM). Validated DIMM speeds up to 2666 MT/s on 1st Gen and up to 2933 MT/s on 2nd Gen. Max per DIMM 128GB (LRDIMM). Max memory: RDIMM 3TB, LRDIMM 6TB; up to 15.36TB with Intel Optane DC Persistent Memory (DCPMM/PMem) combined with LRDIMM. Also supports up to 12 NVDIMM-N (384GB max).

Confirmed = listed in the vendor's memory documentation for this server. Vendor match = the vendor's own part cross-reference matches the module and its speed is validated for the platform; not taken from this server's memory list. Spec match = meets this platform's JEDEC requirements (generation, form factor, validated speed); interchangeability is spec-based, not per-server testing. How we verify →