The Mac Pro still has auxiliary power connectors, so you could theoretically install a GPU in it, just not the highest end ones. No drivers so you can't really do anything with them. I do suppose Nvidia could maybe do CUDA drivers for a card, but would Apple even allow it?
@paul The two SATA ports are also a little confusingly still there - couldn’t slap some NVMe ones? Guess you could put them on an expansion card…
@ckelley87 that's just copy/paste from the 2019, probably uses the same module which I think is fine.