Lenovo ThinkSystem SR650 V4 — supported memory

Dual-socket, Intel Xeon 6700/6500 (Granite Rapids-SP P-core). Up to 32 DIMM slots (16/CPU, 8 channels x 2 DPC). TruDDR5 RDIMM, 3DS RDIMM, and MRDIMM (MRDIMM only on a subset of Xeon 6 CPUs). Speeds CPU-dependent: RDIMM up to 6400 @ 1DPC, up to 5200 @ 2DPC; MRDIMM up to 8000 @ 1DPC only (no 2DPC; 8800 NOT supported — datasheet caps MRDIMM at 8000). Up to 8 TB (32x 256 GB 3DS RDIMM); max 256 GB/DIMM. Also supports CXL 2.0 memory (E3.S 2T).

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 →