For good deals on anything computers including RAM go to
www.pricewatch.com make sure you know what kind of RAM you can use and the maximum amount your mobo can read. RAM is random access memory when you run a program the files are taken from the Hard Drive and put on the RAM that's why the more the better and corrupt means lock up or freeze. RAM is deleted every time you shut off your computer or restart it. And what tigerx said the more isn't always the best if you get more than your computer can read then you wasted money and the computer wont access any of the Memory on the stick with the extra amount rendering the entire piece useless. AND please make sure you know what kind to get since there are different forms. PC2700 and PC133
Threaded Mode