The current video bios’s have x86 assembly in them making them not compatible. Work would need to be done here first. Historically, GPU’s released for Mac’s have had their own bios anyway (EFI support).

Then Apple will need to include drivers for the card in the OS (AMD drivers in MacOS typically lag 9 months from availability of the card for Windows) or alternatively NVIDA would need to write new drivers that Apple approves of, instead of shipping the same binary blob to all three platforms (the NVIDIA drivers were very buggy on MacOS).

Will Apple and AMD / NVIDIA strike up a partnership to do this? Not sure why they would.

I expect NVIDIA to have ARM friendly GPU’s on Windows before AMD though, given their interest in the space & SOC’a they make.

It will be interesting to see if in PC / ARM land if standards arise for motherboards, plug and play components, or if we will only ever sell & buy completely integrated systems.