Arch Memory Certified for Apple 16 GB (2 x 8 GB) 204-Pin DDR3 So-dimm for MacBook Pro 15-inch Core i7 2.3 GHz MD103LL/A RAM 2 x 8GB DDR3-1600 PC3-12800 204Pin Sodimm 1.5v Dual Rank (2Rx8) 1600MHz Arch Memory is a Registered Trademark of Arch Computer, LLC Lifetime Replacement Warranty Included