OWC 8GB (2 x 4GB) PC12800 DDR3L 1600MHz SO-DIMMs Memory Compatible With 2011-2015 iMac, 2011-12 Mac mini, and 2011-2012 MacBook Pro (non-Retina display) models Product Specs: Technology: DDR3L SO-DIMM Density: 4GB (4096MB) per module 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 /Intel Specifications Fully Compliant with JEDEC specifications RoHS Certified Warranty Safe Upgrade. COMPATIBLE: MacBook Pro 17-inch (2011 Model ID: MacBookPro8,3) (Early 2011 Model ID: MacBookPro8,3) MacBook Pro 15-inch (2011 Model ID: MacBookPro8,2) (Early 2011 Model ID: MacBookPro8,2) (2012 Model ID: MacBookPro9,1)  MacBook Pro 13-inch (2011Model ID: MacBookPro8,1) (Early 2011 Model ID: MacBookPro8,1) (2012 Model ID: MacBookPro9,2) 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 2012Model ID: iMac13,2) (Mid 2011 Model ID: iMac12,2) iMac 21.5-inch (Early 2013 Model ID: iMac13,3) (Late 2012 Model ID: iMac13,1) (Mid 2011 Model ID: iMac12,1) Mac mini (Late 2012 Model ID: Macmini6,1 & Macmini6,2) (Late 2012 Server Model ID: Macmini6,2) (Mid 2011 Model ID: Macmini5,1 & Macmini5,2) (Mid 2011 Server Model ID: Macmini5,3) PC Laptops: Compatible with Intel / AMD Process based PCs capable with the specifications listed above. Memory complies with JEDEC Specifications, document JESD79-3B. This OWC Memory is NOT COMPATIBLE with… MacBook Pro 13-inch Retina Display (2014 Model ID: MacBookPro11,1) (2013 Model ID: MacBookPro11,1) ( 2012, 2013 Model ID: MacBookPro10,2) MacBook Pro 15-inch Retina Display (2014 Model ID: MacBookPro11,2) (2013 Model ID: MacBookPro11,2; MacBookPro11,3) (2012, 2013 Model ID: MacBookPro10,1)