my girlfriend just maxed out her iBook G4 to 640mb, orphaning the old 128mb PC2100 so-dimm. will this chip work in an iBook G3? another friend of mine has a G3 iBook with only 128mb and we would like to give her this extra 128mb if it will work in her iBook. i know the G4's ram is 'faster' but would it work at the lower PC100 speed in the G3 iBook, or would it not even work at all? thanks.