Corsair TW3X4G1600C9D Dominator 4 GB Memory Kit for PC3-12800 1600Mhz 240-pin Dual Channel DDR3 Corsair Memory is optimized for the Microsoft Windows Vista client operating system Latency of 9-9-9-24 for maximum reliability and performance Each memory module is individually tested to give you Peace of Mind that it Will Not Fail, Guaranteed! Industry Leading Lifetime Warranty 2 X 2GB PC3-12800 1600MHz 240-pin DDR2 Timing: 9-9-9-24 1.5v Memory Type: DDR3; Speed: 1600MHz