This is a totally newbie question, but i have been surifng these boards for just over a week now and questions keep croping up. I have been reading the 'Is Core Duo 64-bit' thread, and as much as its a nice idea, hmmm, even i am sceptical. However, my question is related to RAM. Someone said that the iMac and MBP are physically limited to 2GB RAM. Then someone else said surely they can take 4GB RAM because there are two slots and you can now get 2GB RAM sticks and Tiger supports 4GB RAM. I think some kind of debate then took place. To put the questions easily: - How much RAM can the MBP really take Maximum? (I thought it was 2GB) - What limits the amount of RAM able to be taken by a computer/laptop? - Could Tiger or something else, be upgraded in the future to allow the MBP to accept more RAM? Thanking you muchly kind folk!!