16GB Total. 4pcs 4GB DDR3L, 1333MHz, ECC, CL9, 2R, X4, 1.35V, Registered, DIMM, 240-pin THIS MODULE IS MANUFACTURED BY Computer Memory Solutions LIFETIME WARRANTY BY Computer Memory Solutions
Compatible with: Lenovo
ThinkServer RD640 Maximum Memory: 320GB
Expansions: 12 Socket (s) CPU 1 8 Socket (s)
CPU 2 Important: Faster memory will clock down to run at optimal speed and voltage depending on processor model and number of modules installed.