Barefeats.com has posted the first of (hopefully) many articles about Macs using eGPUs.
MacVidCards eGPU Titan-X tested at Barefeats.com
The 2nd half of the article will continue with some Pro apps. Netkas and I have been at the forefront of eGPU Mac tech for some years now. Either here or at his board we will shortly lay out the easy way to mod current system files to allow eGPU usage.
I have been testing Far Cry 4 on a 2014 Mini at 4K for some time. It's amazing that Apple's least powerful desktop can "run with the big boys" when connected to a Titan-X. Thanks again to Nvidia for continuing to provide drivers for latest cards, despite Apple's apathy toward serious computing.