I bought a prebuilt computer about a month ago with 2GB memory already installed. It's Pc2 5300 memory and I have two more slots open. Since ddr2 memory is so cheap, should I upgrade to 4GB of ram since I can get 2GB from newegg for $80. I have vista and I have all those little side gadgets and I never see more than 55-60% of my ram being used, but I heard that vista has some kinda feature that uses all your memory for faster upload times and such. So should I spend the $80 on an extra 2GB of ram??