"Thanks to MacVidCards, there is a breakthrough in the support of NVIDIA GPUs in eGPU Boxes. They now work connected to the 2013 Mac Pro cylinder running macOS 10.13.4 -- without patching the OS."
That's right, the cards are nearly ready to ship.
Part 2 is coming, more cards, more Macs, more "breakthrough" revelations. Stay tuned.
eGPU is coming to nMP 6,1 as a mainstream item, now longer a hobbyist's weekend tinkering project.
10.12.6, 10.13-`10.13.4, and Win 10 all supported. Ready for VR.