Corsair 8GB (2x4GB)  DDR3 1066 MHz (PC3 8500) Laptop Memory 1.5V Maximize your DDR3 notebook potential with 8GB of of super fast Corsair DDR3 memory! Corsair Memory SODIMMs are optimized for the Microsoft Windows Vista client operating system Online 24/7 Customer Support available at www.asktheramguy.com for your convenience and questions Each memory module is individually tested to give you Peace of Mind that it Will Not Fail, Guaranteed! Lifetime Warranty!, Refer user guide below