Ricoh PFU S26361-F3909-L716 16 GB DDR4‑2666 MHz (PC4‑21300) unbuffered ECC DIMM memory module from Fujitsu, designed for server and enterprise systems. It operates at 1.2 V with dual‑rank ×8 configuration, CL19 latency, and uses a 288‑pin DIMM form factor to provide reliable performance with Error‑Correcting Code (ECC) support for enhanced data integrity