Ricoh PFU S26361-F3843-E618 64 GB DDR4‑2133 MHz PC4‑17000 server memory module from Fujitsu, featuring ECC (Error‑Correcting Code) and registered load‑reduced DIMM (LRDIMM) technology. It has a 288‑pin form factor, 1.2 V operating voltage, CL15 latency, and quad‑rank (4Rx4) architecture, designed for reliable high‑capacity memory performance in server systems.