I think the stub Mac graphics driver might make any Mac compatible card ”work”, but without a driver for the specific card, you will be severely limited in performance.
The best cards I know of that are definitely supported well are the IMS Twin Turbo (sometimes called ixmicro Twin Turbo), but needs to be a Mac edition (not sure if they made PC Cards) or a Matrox Millennium 1 or 2 Mac edition, though a PC Matrox Mil 2 can be flashed to Mac - I did this a long time ago, but don’t remember much about it and no longer have that card. Both of these give you acceleration and will do huger resolution and have Game kit compatibility.
Most of the other cards are unknown.
All of the Mac PCI IDE cards required some type of driver iirc, so none were BeOS ready. They were generally pretending to be SCSI also, so the on disk formatting was weird.
I have a Matrox G450, which is a PCI dual head card. But though it worked in Intel, I don’t think it was Mac compatible in any way. The BeBox I had was using a Mil 2 so I never tried it in it.
@cocobean are you saying there are PCI variants of these cards that have Mac compatibility?
I guess to @_AP , are you asking about Mac, BeBox or in general? The BeOS has 3 different kernels. Intel, Mac and Joe. The Joe kernel is BeBox only. It allows for more general hardware support. The Mac kernel is hobbled by the Mac hardware support and weird PCI limitations. So there is no ”all cards are supported on PowerPC” because of all the weird requirements and restrictions the Mac PCI support has.