64GB Total memory consisting of 2PCS 32GB DDR3L, 1066MHz, ECC, CL7, 4R, X4, 1.35V, Registered, DIMM, 240-pin MANUFACTURED BY Computer Memory Solutions Guaranteed to work in your server Lifetime warranty by Computer Memory Solutions Compatible with Dell PowerEdge T420 Maximum Memory 384GB Sockets 6 Sockets (3 Banks of 2) Per Processor 12 Sockets Total 4GB Reg ECC modules come in two versions: 313/4G using x4 and 3138/4G using x8 DRAM. The two parts may be installed in the same system but not within the same memory bank. Use like modules within a memory bank