I currently have a 500 BTO TiBook with 512 MB or RAM (one 256 MB RAM in each slot). I would like to know that if I were to upgrade my RAM in the future, could I remove both the 256 MB RAM from each of their respective slots and replace them with a 512 MB RAM to give me a total of 1 GB of RAM? I know that the top RAM slot in the TiBook is easier to remove, but I'm not quite sure about the bottom slot. Any advice or insight is appreciated. 