8GB Total. 1pcs 8gb DDR4, 2133MHz, ECC, CL15, 2R, X4, 1.2V, Registered, DIMM, 288-pin BRAND Computer Memory Solutions LIFETIME WARRANTY BY Computer Memory Solutions COMPATIBLE WITH
Lenovo ThinkServer RD650
Standard Memory: 4 GB (Removable)
Maximum Memory: 768 GB Reg ECC RDIMM 1.50 TB
ECC LRDIMM Expansions: 12 Socket (s) per CPU 24 Socket (s) using two
CPUs Important: Memory will clock down to run at optimal speeds depending on processor model and number of modules installed. Mixing Registered and Load Reduced modules CANNOT be mixed within the same system.