Arch Memory Certified for Apple 2 GB (1 x 2 GB) 200-Pin DDR2 So-dimm for Apple MacBooks RAM Arch Memory is a Registered Trademark of Arch Computer, LLC 1 x 2GB DDR2-667 PC2-5300s 200-Pin Sodimm CL5 Dual Rank (2Rx8) 667MHz Lifetime Replacement Warranty Included