> the Radeon 9200 that is inside the Mini (if I remember well it's neither
> a real AGP one)

I believe it is a real AGP one and it's just that MorphOS pre-3.0 cannot use AGP transfers regardless of the machine, so that even on machines with real AGP slots (i.e. PowerMac G4) AGP transfers will only be available with MorphOS 3.0.