>> I don't know where boot_wb's "Max 1GB" for the PowerMac3,1 comes from, though.

> Considering I've referenced everything so thoroughly I'm a little disappointed ;-)
> It comes from the Apple manual reference [3] purporting to relate to both PCI
> and AGP models.

I had skimmed through the document ("[3] - Apple Documentation "Setting up your Power Mac G4 (PCI/AGP)", accessed 25/8/10 from here") that you present as source right before I wrote that sentence, but couldn't find that information unfortunately. Maybe I overlooked the relevant page. Would you please point to the exact page?

> this manual never refers to AGP expansions

But it does. There are no less than 8 pages in this document which refer to AGP.