OWC - 4GB OWC Memory Upgrade Module - PC14900 DDR3 1866MHz SO-DIMM for 27-inch iMac w/Retina 5K Display (Late 2015) models and compatible PCs

4.0 GB (1 x 4GB) 1867 MHZ DDR3 SO-DIMM PC3-14900 204 Pin CL11 Memory Upgrade Memory upgrade kit For 2015 (Late) iMac 27" w/ Retina 5K models (October 2015) Model ID:iMac17,1: 3.2GHz i5, 3.3GHz i5, 4.0GHz i7 Product Specs: Technology:?DDR3 SO-DIMM RoHS:?Yes Pin Count:?204-pin Op. Data Rate:?DDR3-1867 Speed:?PC3-14900 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 Apple/Intel Specifications. Fully Compliant with JEDEC specification. RoHS Certified International products have separate terms, are sold from abroad and may differ from local products, including fit, age ratings, and language of product, labeling or instructions.