A friend of mine recently purchased an ibook and got a 512K RAM chip with the deal. He uprgraded to a 1GB chip and is offering me the 512K chip. Problem is, I use a 600mhz G3 12.1 ibook. Is the chip that was intended for the user's slot on the 1.2 G4 12 inch ibook compatable with my older model G3 ibook? Thanks for any help.