My sister has 1 gig of ram in her Macbook, and it is running slow recently. So I assume another gig will help it. Can you put iMac ram into a macbook? They are both 2008 models I think. Also, how many ram slots does it have? Could I just buy another gig, or would I need a 2 gig stick? And what are some good websites in Australia to buy ram? Thanks.