benchmarked: GTX 780Ti - 980 - 980Ti / 2016 13" MBP-eGPU vs quad-core Hackintosh-PCIe
Super Highend Hackintosh 32GB RAM - quad core i7 4,5Ghz (overclock)
MacBook Pro 2016 8GB RAM - dual core i5 2,9Ghz
I think eGPU result are IMPRESSIVE considering the configuration differences.
I almost forgot!!!!
with 980 I didn't needed an USB-C/Thunderbolt 3 plugged other than eGPU
Yes but you can find 780 Ti very cheap and optimization shine in Mac side.
I wouldn't expect a 980 to do very well on DA-2. I have to underclock and underpower my Zotac 970 to make it stable with DA-2. (Stock clocks and even a mild overclock at 100% or 110% power are ok for Heaven benchmarks, but explosions/fire effects while gaming will trip and shut down the DA-2. Right now I'm mostly but not completely stable at 90% power and -50 mhz core [max ~ 1228 mhz boost], still getting the occasional shutdown.)