I built a simple, no-hacks-needed TB2 eGPU for Bootcamp use. The caveat is that an external monitor is required, but other than that it's basically 100% reliable: http://archagon.net/blog/2016/12/31/cheap-and-painless-egpu-...

This thing must have extended the life of my laptop by 2-3 years.

I’m playing PUBG on a MB Pro Mid-2015 (integrated graphics only) with a Akitio Node TB3 + nVidia 1060. It worked out of the box on Windows 10.

Yes I’m losing some bandwidth stepping down to TB2 but it’s enough to satisfy some casual gaming.

You take a performance hit even with tb3. Tb2 (for eGPU) is not directly supported by Apple and not really worth it.