Corsair CMSA8GX3M1A1600C11 Apple Certified 8 GB DDR3 1600MHz (PC3 12800) Laptop Memory 1.35V Density: 8GB (1x8GB) Speed: 1600MHz. 204-pin DDR3L SODIMM Timing: 11-11-11-30 Limited Lifetime Warranty Compatible with MacBook Pro (13-inch, Mid 2012), MacBook Pro (15-inch, Mid 2012) Memory Type: DDR3L; Speed: 1600MHz