[Maursault]

There are two issues.

     1) Apple Silicon won't support PCIe. 

     2) Apple doesn't want it to.

#2 means Apple is taking nVidia and AMD head on in the GPU space. Apple wants to control everything, and allowing these competitors on their platform is giving away too much. Because Apple Silicon scales better than competitors' hw, the desire for third party GPU is probably going to evaporate within a few generations of Apple Silicon. I mean, we'll see, but that is my best guess, because it seems like that was an intentional decision rather than oversight.

[bhj]

AS supports Thunderbolt just fine. Isn't the lack of eGPU support due to lack of ARM drivers for them?

[Maursault]

To suggest it is merely lack of drivers is an oversimplification. There is a chip errata that prevents PCIe GPUs from working properly on Apple Silicon: the architectures are not compatible. Apple Silicon GPU drivers are deeply integrated into the system. Due to this integration, only graphics cards that use the same GPU architecture as Apple Silicon could be supported, and there just aren't any, and I don't see how there could be unless Apple developed one and released it.

[nordsieck]

It'll be interesting to see what happens with the Mac Pro.

It could be that Apple does away with it entirely and the Mac Studio is the new Pro.

Or they might make a machine with PCIe support, but make it so expensive that only people with a serious need get access to it.

Or something else.

[Maursault]

> It could be that Apple does away with it entirely and the Mac Studio is the new Pro.

Or the Mac Pro will be released without PCIe GPU support, and Apple will be able to leverage increases in Apple Silicon GPU performance to eliminate any need or desire for PCIe GPU, drawing away high end GPU customers from nVidia and AMD and locking them into Apple Silicon and the Apple ecosystem.