I just purchased a new 20" 2.4 GHz iMac with 1 GB RAM. I currently have a 15" iMac G4 with 768 MB RAM. Is it possible for me to remove the extra 512 MB stick from the secondary slot in my old iMac and place it in the secondary slot on my new Mac to upgrade to 1.5 GB? Is it the same type of RAM? Thanks for the help.