Cisco UCS C240 M5 — supported memory

24 DDR4 DIMM slots (12 per CPU). 6 memory channels per CPU, up to 2 DIMMs per channel (2 DPC). 1 or 2 CPU sockets. Supports Intel Xeon Scalable (1st Gen) and 2nd Generation Intel Xeon Scalable processors. DIMM types: Registered ECC RDIMM, Load-Reduced LRDIMM, TSV-RDIMM, plus Intel Optane Persistent Memory (PMem). 2666-MHz DIMMs run with 1st Gen CPUs; 2933-MHz DIMMs required for new builds with 2nd Gen CPUs (DIMMs down-clock to 2400/2133 with slower CPU SKUs). Max per DDR4 DIMM: up to 256 GB (2933-MHz LRDIMM, 2nd Gen only; 128 GB max with 1st Gen). Up to 9 TB total memory possible using 12 x 256 GB DDR4 DIMMs + 12 x 512 GB Optane PMem. Source: Cisco UCS C240 M5 SFF Spec Sheet.

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 →