Arch Memory Certified for Apple 16 GB (2 x 8 GB) 204-Pin DDR3 So-dimm for MacBook Pro 17-inch Core i7 2.3GHz Early 2011 BTO/CTO RAM 2 x 8GB DDR3-1333 PC3-10600 204Pin Sodimm 1.5v Dual Rank (2Rx8) 1333MHz Arch Memory is a Registered Trademark of Arch Computer, LLC Lifetime Replacement Warranty Included