I suspect that the need for built-in Firewire is more to delineate the models that will best run Tiger; it has nothing to do with Firewire per se. More likely that there are specific improvements to the motherboard in terms of bus speed, RAM, built-in video cards that were already standard by the time that built-in Firewire came down the pike. That's why the specific mention of BUILT-IN Firewire is there; just because you've put an IDE firewire card in your beige G3 233 mhz PowerMac doesn't mean that Apple wants to support it. That's what xPostFacto is for :-) Michael