Arch Memory Certified for Apple 8 GB (2 x 4 GB) 204-Pin DDR3 So-dimm for MacBook Pro 15-inch Core i7 2.0GHz Early 2011 MC721LL/A RAM 2 x 4GB 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