Quote: "There is a very tricky workaround to avoid error 43 on GTX10xx videocards (!will not work with 1050 and 1060 3GB cards!), which is quiet popular in our russian egpu community. I didn’t try it, but i have read a lot of successful stories about it. So do it on your own risk!
Here is the instruction:
1. Download from nVidia archive 368.81 and 378.78 drivers.
2. Uninstall all current nVidia drivers using DDU, and reboot (or it will be rebooted automatically).
3. Install 368.81 and DO NOT REBOOT your system.
4. Open your registry editor, proceed to HKEY_LOCAL_MACHINE\SOFTWARE and delete nvidia_rebootneeded. (thanks Cacada for this additional step)
5. Start installing 378.78 (not clean install!).
6. Reboot your system after install procedure will be done and there will be no error 43, and videocard will work perfectly with 378.78 driver."
Just found this on egpu io forum, and successfully installed 384.94 for my 1080. Have been using 372.70 before.