Corsair 2GB (2x1GB) DDR2 533 MHz (PC2 4200) Desktop Memory Each memory module is individually tested to give you Peace of Mind that it Will Not Fail, Guaranteed! Online 24/7 Customer Support available at www.asktheramguy.com for your convenience and questions Corsair Memory is optimized for the Microsoft Windows Vista client operating system Lifetime Warranty! 2 X 1GB PC4200 533Mhz 240-pin Timing: 4-4-4-12