OWC 16.0GB UPGRADE: Consists of a 16GB DDR3L 1600MHz PC3-12800 CL11 SO-DIMM 1.35V 204-pin Memory Module Compatible with Mac and PC 100% COMPLIANT: With JEDEC Standard Specifications, ROHS Compliant, Warranty Safe Upgrade. Designed and Tested to Meet or Exceed All MAC Specifications for iMac and PC Laptops COMPATIBLE WITH: 2015 (Late) iMac 27' w/ Retina 5K models and compatible PCs COMPATIBLE PART NUMBERS: CT204864BF160B, MT16KTF2G64HZ-1G6A1, MT18KSF2G72HZ1G6, INT1600SB16L INCREASED PERFORMANCE: Memory Upgrades are the Most Effective and Easy Way to Boost the Performance in Your Mac or PC INDUSTRY LEADING: Consumer Friendly Advanced Replacement Program and Limited Lifetime Warranty, which Includes Free Tech Support by Other World Computing OWC Lifetime Limited Warranty including Advanced Replacement Program