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This is due to the x2 PCI Express Root Port #9 – 9D18 to which these ports attach.
Let’s discuss graphics switching in Windows briefly.
It makes total sense to disable the entire line of communication to the d GPU so that we can free up resources for the USB-C/Thunderbolt 3 ports.
The 13″ Mac Book Pros have no direct Thunderbolt 3 to CPU connection.
Through trial and error, we found the right-side Thunderbolt 3 ports under PCI Express x4 Controller – 1909 is the best way to connect an e GPU to the 15″ Thunderbolt 3 Mac Book Pro.
This is especially relevant when using an AMD Radeon e GPU in which both PCI Express Controller 19 need to be disabled to resolve error 12.
Now that mac OS High Sierra 10.13 officially supports e GPUs, we’ve developed a reliable procedure to set up and maintain a functional e GPU in Windows 10 via Boot Camp.
In the past month, we’ve tried many different solutions by reading through e GPU implementation guides.
Windows 10 can detect new graphics cards and install the drivers automatically.
However the drivers are not up-to-date and sometimes interfere with setting up an e GPU.
Forum member Sky11 explained the three modes in Windows 10 (Microsoft Hybrid graphics, AMD XConnect, and Nvidia Optimus) in this post.
The crucial prerequisite is the Intel integrated graphics card for internal display acceleration with an e GPU.
We recommend using DDU to uninstall the Radeon Pro drivers that came with Apple Boot Camp drivers 6.1 (part of Boot Camp Assistant in mac OS).