Dell PowerEdge MX840c — supported memory

Up to 48 DDR4 DIMM slots total (four-socket double-width compute sled for the MX7000 chassis; two or four Xeon Scalable / 2nd-gen Xeon Scalable CPUs). Up to 3 TB RDIMM / 6 TB LRDIMM (up to 128 GB per LRDIMM). Speeds per Dell technical reference guide: 2933 and 2666 MT/s (2933 requires 2nd-gen Xeon Scalable per spec sheet, CPU-dependent). Also supports NVDIMM-N (12 slots, 192 GB max, system board only) and up to 24 slots of Intel Optane DC persistent memory (12.2 TB PMem, 15.36 TB max total).

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 →