I just got an original 867MHz Powerbook G4 to use when I'm out so I don't have to risk damage/theft to my MacBook Pro. I've decided to go ahead and max it out in RAM. It calls for 200 pin PC2100DDR. If I were to get a stick of PC2700DDR that was 200 pin, would it be backwards compatable? The 2700 is a little easier to find and also cheaper from what I have found so if I can I'd rather get some of that.