Can you switch RAM between computers? I'm about to upgrade to 4gigs (originally have 2), I was recommended to Crucial.com by another Mac user and intend to buy from them. Anyway, I have a month old white MacBook 13inch, 2ghz, Intel Duo Core and I want to know if I can give a friend my RAM. My friend's computer is a PowerBook G4, 1.33 ghz, PowerPC. She says she think she bought it in 2005, but it might have been 2006. Is this possible?