I recently bought a Nvidia GeForce 960 Strix from Asus and a EXP GDC Beast 8. When I first started I had the error 43 in the device manager, after a few hours I fixed it with the Nvidia Display Driver Uninstaller and the DIY eGPU Setup 1.3, then the error code 12 appeared and I could never fix it. Then a few hours later, the error code 43 appeared again and when I tried to fix it like the 1ºst time, it didn't work.
I have search almost every page of google and I couldn't find a solution, If someone knows how to fix please reply.