32GB Total. 2pcs 16GB DDR4, 2133MHz, ECC, CL15, 1R, X4, 1.2V, Registered, DIMM, 288-pin Genuine CMS brand, CMS is one of the most trusted names in the Computer Memory industry and this product carries a Lifetime Warranty from CMS Compatible with: Dell PowerEdge R430 Maximum Memory: 192GB Reg ECC RDIMMs 384GB with release of 32GB module Expansions: 8 Socket(s) CPU 1 4 Socket(s) CPU 2 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