Hey all, first time poster... I have an old sawtooth G4 (400mhz) that has since been upgraded to 1ghz. Are there or will there be G5 upgrades available for the G4 based computers. There are G4 upgrades available for G3s so I figure I'd inquire. As it stands, I am not even close being able to run the new Civ 4 game. Thanks!