32GB Total. 4PCS 8GB PC3-10600 240 pin DIMM DDR3 1333MHz ECC REGISTER Major brand memory. THIS MODULE IS MANUFACTURED BY MAJOR BRAND LIFETIME WARRANTY BY MANUFACTURED Compatible with: Dell PowerEdge R720 MAX MEMORY: 128 GB ECC UDIMMs 384 GB 24 x 16GB DR RDIMMs 512 GB 16 x 32GB QR RDIMMs EXPANSION: 24 Sockets (6 Banks of 4) We offers "K4" Kit part numbers for Quad Channel mode. 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.