Trying to get a working egpu in boot camp on my 13" touchbar MacBook Pro (16gb memory, if that matters). I'm using a Razer Core with an RX 480 4GB.
To do: Create my signature with system and expected eGPU configuration information to give context to my posts. I have no builds.
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Try to disable your PCIe Controller (x4) in Device Manager.
Pls perform step (2) at https://egpu.io/forums/mac-setup/2016-macbook-pro-solving-egpu-error-12-in-windows-10/
eGPU Setup 1.35 • eGPU Port Bandwidth Reference Table
2015 15" Dell Precision 7510 (Q M1000M) [6th,4C,H] + GTX 1080 Ti @32Gbps-M2 (ADT-Link R43SG) + Win10 1803 [build link]
Thanks, nando4! I should be able to try that option in the next couple of days. I might also try out Alec's suggestion, which seems simple enough.
How did you get the address 001C043E from itsage's work? I don't see it in his screenshots anywhere. Also, what is the "8" for after the PCI type? ...Just trying to understand how this works. 
To do: Create my signature with system and expected eGPU configuration information to give context to my posts. I have no builds.
.I was able to apply the EFI mm script using refind. It didn't include a shell, so I grabbed one from the refit distribution. This is actually a nice tool; thanks for recommending it.
To do: Create my signature with system and expected eGPU configuration information to give context to my posts. I have no builds.
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@Trajans Row very good to hear. What many have found is that Nvidia GPUs play better with eGPU setups. If you look at success reports, the number of Nvidia cards far exceeds that of AMD ones.
I was one of the first few who got the RX 480 to work in macOS beta (in a tower Mac Pro). We found certain brands (XFX in particular) have their custom vBIOS which doesn't play well with macOS. More extreme case was the XFX RX 460 causing boot hang/black screen. The RX 460 was supposed to work right out of the box for Macs (same drivers as dGPUs in 2016 MBP).
We'd love to see photos of your setup.
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2020 13" MacBook Pro [10th,4C,G] + RX 5700 @ 32Gbps-TB3 (Prototype eGPU Enclosure) + macOS 10.15.4 & Win10 1903 [build link]
It became clear to me as I worked on this more that the card model is almost as significant as the card chipset. I wish people would emphasize that more when talking about their setups.
To do: Create my signature with system and expected eGPU configuration information to give context to my posts. I have no builds.
.@Trajans Row, did you try the following to get the iGPU and eGPU working such that accelerated internal LCD mode works? https://egpu.io/forums/mac-setup/thunderbolt-3-egpu-with-late-2016-macbook-pro/#post-49
eGPU Setup 1.35 • eGPU Port Bandwidth Reference Table
2015 15" Dell Precision 7510 (Q M1000M) [6th,4C,H] + GTX 1080 Ti @32Gbps-M2 (ADT-Link R43SG) + Win10 1803 [build link]
I didn't try that, but it's interesting... does that somehow turn on X-Connect? Does XC have control software like Optimus?
To do: Create my signature with system and expected eGPU configuration information to give context to my posts. I have no builds.
.Yes, @goalque activated AMD's X-connect popup. It's AMD's Optimus equivalent. In both cases, the iGPU must be functioning for the accelerated internal LCD mode to work.
I didn't try that, but it's interesting... does that somehow turn on X-Connect? Does XC have control software like Optimus?
eGPU Setup 1.35 • eGPU Port Bandwidth Reference Table
2015 15" Dell Precision 7510 (Q M1000M) [6th,4C,H] + GTX 1080 Ti @32Gbps-M2 (ADT-Link R43SG) + Win10 1803 [build link]