16GB Total. 4pcs 4GB PC3-10600 240pin DIMM DDR3 ECC Register 1333MHz Major brand memory. In this system you can use 1333mhz as well as 1600mhz. We will ship any one of those parts THIS MODULE IS MANUFACTURED BY MAJOR BRAND LIFETIME WARRANTY BY MANUFACTURED
Compatible with: Dell
PowerEdge R520 MAX MEMORY: 48GB ECC UDIMMs 384GB Reg
ECC RDIMMs EXPANSION: 6 Socket (s) per each processor 12 Socket (s) total This system supports either Registered ECC or Unbuffered ECC memory. Mixing Registered ECC and Unbuffered ECC modules is not supported within this system. 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.