I originally had 2x512mb sticks installed so i went out and bought 2x1024mb stick to put in my machine to add up to 3072mb all up. When i go into system set up on during boot up, it says i have 3072, but in Vista it says i have 2303mb installed?? And my Windows Experience index for RAM went from 4.5 with 1024mb installed to 4.0 with the new RAM installed. Any ideas??