Hello, I am wanting to upgrade my two laptops and my desktop's memory. I am trying to figure out how I can know what memory to buy and where to go to get a decent deal. I figure one of my laptops and my desktop wouldnt be too difficult. My desktop is a Sony Vaio PCV-RS510 and my laptop that I believe is easier is a Dell 300m. However, my other laptop I bought in Japan. It is a Sony Vaio VGN-FJ91S, and that is the one I am most interested in upgrading. It looks almost exactly like the American Vaio FJ series, however I am unsure if it is the same on the inside. Any help for any three of these would be greatly greatly greatly appreciated! Thanks for reading!