I'm using a 2015 MBPr 15" (running windows 10 through bootcamp), with a gtx 1070 plugged into an akitio thunder 2, which plugs in to the thunderbolt port on my laptop.
I tried to install the drivers, but the installation software cant recognize the gpu plugged into the thunderbolt port. It also doesn't show in device manager. Interestingly enough, several new things appear in device manager, under system devices, several PCI upstream and PCI downstream switch ports are connected, which seem to be from the thunder2. The lights on the GPU itself change depending on whether or not it is plugged into the thunderbolt port, and I'm certain that it's getting enough power from my PSU.
Can anyone help me get this set up?