>> In theory - if you succeed to find (or make) some AGPx1->PCI riser
>> [...] you can try PCI card in AGP slot
> I see if I can find it.
Good luck. I've never seen such thing.
Me also not. Only xserve G4 have similar 90° riser
You need AGP 1x v1.0, 3.3V and PCI v2.1 3.3V 66MHz.
If you very need it, you have to made it. It looks easy.
AmigaOS3: Amiga 1200
AmigaOS4: Micro A1-C, AmigaOne XE, Pegasos II, Sam440ep, Sam440ep-flex, AmigaOneX1000
MorphOS: Efika 5200b, Pegasos I, Pegasos II, Powerbook G4, Mac Mini, iMac G5, Powermac G5 Quad