8GB 2 X 4GB Memory for iMac 27" inch 3.2GHz Quad Core Intel Core i5 Late 2013 ME088LL/A 1600MHz DDR3 (PC3-12800) SO-DIMMs RAM (PARTS-QUICK BRAND) Halogen Free; ROHS Speed: PC3 12800 1600MHz Form Factor: 204 pin SODIMM Capacity: 8GB 2X4GB KIT Warranty: Lifetime