Ok, it seems that I can upgrade an 800Mhz G4 iBook with a 1GB RAM chip. Problem is, tons of websites are saying that only certain chips work in it. Can anyone point me to a guide or list of known working RAM for these? I really want to upgrade this iBook past the supposed 640MB limit! Or should I take the risk and just order a 1GB PC2100 chip from newegg and hope for the best?