32GB Total. 2pcs 16gb DDR4, 2400MHz, ECC, CL17, 2R, X4, 1.2V, DIMM, 288-pin Brand BY Computer Memory Solutions LIFETIME WARRANTY BY Computer Memory Solutions Maximum Memory: 64
GB Expansions: 4 Socket (s) Memory will clock down to run at optimal speeds depending on processor model installed.
Compatible with: ASRock Motherboard Fatal1ty X99M Killer, Fatal1ty X99M Killer/ 3.1, X99 Extreme3, X99M Extreme4