You might need to buy upgraded mach chips for it if it has not been done already.
It must been around 17 years since i upgraded mine with the multimedia mach chips so i have forgotten why i bought them but iirc it was needed to use any of the better drivers with the first mediator board (later boards was sold with them?)
I was using mine with a b1260 and for a short while i had one Radeon in it because i modded the card to work with mediators and i didn't want to risk to blow my Mediator4000 incase my mod was bad.
