Updating ram on new macbook pro
The x16 PCI Express Controller connects to the Radeon Pro d GPU.
The x8 PCI Express Controller connects to the left-side USB-C/Thunderbolt 3 ports.
However the drivers are not up-to-date and sometimes interfere with setting up 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).
All PCIe lanes are routed through the platform controller hub (PCH).
The name of the game is to allocate enough resources for the external graphics card to function in Windows 10 while not severely crippling other functionalities of the laptop.
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.
DDU can also disable Windows automated graphics drivers installation.
Keep in mind Apple itself has not provided support for e GPU in Boot Camp.