PACCOM 64GB DDR3L RAM-Kit (4x16GB SODIMM, 1867MHz) for Apple iMac 27" Retina 5K Model 2015 (Skylake) 64 Gigabye DDR3L-1866 RAM-Kit (4x16GB) for new Apple iMac 27" Model 2015 consists of four pieces 16GB SO-DIMM memory-modules Important Note: This memory-kit can only be used in the new 27" iMac models that utilize Intel Skylake processors (i5-6600k, I7-6700k)