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. Made from the highest quality components, Designed to increase productivity and help your computer work faster. Products are engineered to meet industry standard specifications and rigorously tested to ensure quality. Backed by free technical support, a lifetime replacement warranty and legendary reliability, this memory is your best choice for upgrading your computer's memory. If you plan on combining memory with any already existing memory, please contact us prior to purchase to ensure they are compatible or to match in ranking and chip count. Some Server and Workstation Models are compatible with more than one type of memory. Please contact us to confirm it is compatible with your model.