Was looking at an older, used Macbook which uses PC5300 DDR2 667MHz 200 Pin ram. It only has 1gb ram, but I have some ram from my older iMac which is PC6400 DDR2 800MHz 200 Pin. Could I put this ram in the Macbook? I realize at best it would run 667MHz but all Im concerned about is will it work in there. Thanks.