Ricoh PFU S26361-F4026-E616 16 GB DDR4‑2666 MHz (PC4‑21300) server memory module from Fujitsu designed for enterprise environments. It features registered ECC (Error‑Correcting Code) for enhanced data integrity and system stability, a 288‑pin RDIMM form factor, single‑rank ×4 architecture, 1.2 V operating voltage, and CL17‑19 latency, making it suitable for Fujitsu PRIMERGY and other compatible server platforms that support registered DDR4‑2666 memory