Corsair 4GB (2x2GB) DDR2 800 MHz (PC2 6400) Laptop Memory,Corsair,VS4GSDSKIT800D2" /> Perfect upgrade for a Netbook or Notebook and great for Gamers who want more speed out of their systems Corsair Memory is optimized for the Microsoft Windows Vista client operating system Each memory module is individually tested to give you Peace of Mind that it Will Not Fail, Guaranteed! Industry Leading Lifetime Warranty 4GB 2 x 2GB PC2-6400 800MHz 200-pin DDR2 SODIMM (Contains two modules of 2GB each).