1GB Value Select series PC-4200 (533MHz) SODIMM, 4-4-4-12, 200-pin...Designed for current generation notebooks and mini-PCs, Corsair's high density SODIMMs allow users to maximize memory bandwidth and minimize performance bottleneck to deliver superior user experience. The Corsair ValueSelect SODIMMs are optimized for the Microsoft Windows Vista client operating system; Individually tested; Superior hardware design to reduce heat generation.