Arch Memory 2 GB (1 x 2 GB) 200-Pin DDR2 So-dimm DDR2-533 PC2-4200 RAM Arch Memory is a Registered Trademark of Arch Computer, LLC 1 x 2GB DDR2-533 PC3-4200 200Pin Sodimm CL4 Dual Rank (2Rx8) 533MHz Lifetime Replacement Warranty Included