Dell PowerEdge T640 — supported memory

Tower, 24 DDR4 DIMM slots (12 per CPU), 6 channels per CPU, 2 DIMMs per channel. Speeds CPU-dependent: up to 2666 MT/s with 1st-gen Xeon Scalable, up to 2933 MT/s with 2nd-gen (2933 at 1 DPC only, 2666 at 2 DPC; LRDIMM max 2666). Technical guide lists supported speeds 2933/2666/2400/2133/1866 MT/s. Up to 3 TB total (24x 128 GB LRDIMM); RDIMMs up to 64 GB (RDIMM max 768 GB per older docs). Spec sheet's '2993MT/s' is a typo for 2933 (tech guide authoritative). NVDIMM-N also listed by Dell (ignored, not in forms enum). 2133 MT/s operating bin included for consistency with sibling 14G registry rows.

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 →