i have all the cards in order i just was looking into it and the g5 thinks the accel card in ofw is a gpu cause the card runs its own ofw they communicate and the g5 quad has a pcie bus that cant handle more then a combined 1gb of gpu vrm the way the ofw communicates is it tells it that its a gpu and because apple was shit at making a pcie bus the g5 will error out
thats is as far as i got
i got a 6600 and 2 4500fxs that all work in the g5 quad
tldr the ammount of ram on the GigaAccel stops ofw from working on the g5 due to apple pcie bus