DDR3 SO*4GB 204-Pin DDR3-1333 PC3-10600 Sodimm 1333MHz*1.5 volts; Dual Rank (2Rx8)*Access crucial data faster by upgrading your internal memory*Rugged tier one ic chipsets; built for performance and security*Lifetime replacement warranty included*Made from the highest quality components, Arch Memory RAM modules are designed to increase productivity and help your computer work faster. Arch Memory products are engineered to meet industry standard specifications and rigorously tested to ensure quality. Backed by free technical support, a lifetime replacement warranty and legendary reliability, Arch Memory RAM is your best choice for upgrading your computer's memory.