64GB Total. 4pcs 16gb DDR4, 2400MHz, ECC, CL17, 2R, X4, 1.2V, DIMM, 288-pin Brand BY Computer Memory Solutions LIFETIME WARRANTY BY Maximum Memory: 512 GB with ECC RDIMMs Or 1 TB with
LRDIMMs Expansions: 16 Socket (s) Memory will clock down to run at optimal speeds depending on processor model installed. This system supports Registered ECC (RDIMM) or Load Reduced (LRDIMM) memory. Mixing RDIMM and LRDIMM is not supported within this system.
Compatible with: Gigabyte Server (MZ31-AR0) G221-Z30