32GB Total. 2pcs 16 GB of 1867 MHz LPDDR3 SDRAM (PC3-14900) Brand Computer Memory Solutions Lifetime Warranty by Computer Memory Solutions MAX MEMORY: 64GB SOCKETS 4 COMPATIBLE WITH: Apple iMac "Core i5" 3.2 27-Inch (5K, Late 2015) Retina 5K, Late 2015 - MK462LL/A* - iMac17,1 - A1419 - 2834