OWC 32GB (4 x 8GB) PC12800 DDR3L 1600MHz SO-DIMMs Memory Compatible With 2011-2015 iMac models Product Specs: Technology: DDR3L SO-DIMM, Capacity : 32GB (4 x 8GB) (8192MB), RoHS: Yes, Pin Count: 204-pin, Op. Temp.: 0C to +85C, Data Rate: DDR3L-1600, Speed: PC3-12800, CL: 11, Cycle Time: 1.875ns, Voltage: 1.35V, ECC: Non ECC, Module Ranks: Dual Rank Register: Non Parity Low Noise 8-Layer PCB, Meets and/or Exceeds Specifications Fully Compliant with JEDEC specifications, RoHS Certified, Warranty Safe Upgrade. COMPATIBLE: iMac w/Retina 5K display 27-inch (Mid 2015 Model ID: iMac15,1) (Late 2014 Model ID: iMac15,1) iMac 27-inch (Late 2013 Model ID: iMac14,2) (Late 2012 Model ID: iMac13,2)