I have a couple of questions: 1. Can someone explain to me the problem of having two different size RAMs (ex. having 1x1Gb and 1x2GB)? 2. Is there any problem with having 1x1GB RAM from APple and having 1x1GB RAM from a 3rd Party? (By problem I mean, will I run into the same problem i discuss in question #1) 3. I know this a mac forum, but does anyone no any cheap places to buy Vista Home Basic or XP Home? Thanks for your help!