For the community, I am submitting my results after installing and exercising the BizonBox3 w/ a MacBook Pro 2016, 2.9Ghz,. 16Gb, Radeon Pro ... and in the BizonBox3 is an NVIDIA GTX 980 Ti, 6Gb VRAM. Monitor is an LG 34" ultra-wide curved display 3440 x 1440 resolution. XP 11 is configured to about 80% rendering intensity. XP 11 configured at 3440 x 1440 resolution. Performance below is the same whether HDMI or DisplayPort used between the GTX 980 Ti and the monitor.
Averaging 22-25fps via GTX 980 Ti
Crawls at 7-8fps without the BizonBox3 and GTX 980 Ti to the monitor.
The folks at Bizon-Tech indicate that the GTX TITAN would only provide 2-4% more performance, and advised to wait until XP11 is past beta before considering any further investment in graphics.
So you ask why on earth am I using my MBPro 2016 for this purpose. It was a fun experiment and technical challenge to see what the result of the above configuration would do. I can bump the rendering down to 50% mid-range, and the Radeon Pro 460 will yield 22-23fps.
Hope this is of interest to the community.