Check this thread for GTX 1050 Ti:
https://forums.macrumors.com/thread...out-nvidia-pc-non-efi-graphics-cards.1440150/
Personally would not recommend it. There are issues with GTX 750 cards and there is no known reference version or Founders Edition version of GTX 1050. Basically means NVIDIA web drivers MIGHT not work well with the card now or in the future.
Personally would recommend GTX 1060 or higher/better. The GTX 1070 and GTX 1080 are probably best choices and 100% known to work from reports on this forum. I can confirm GTX 1080 FE works perfectly fine with the dual mini 6-pin to single 8-pin power cable on authentic 5,1 with NVIDIA web drivers.
AMD Radeon RX 580 8GB is what the eGPU developer kit contained. Believe it was a Sapphire Pulse RX 580 8GB, but may want to check forums for that. Since it was issued by Apple, it should be supported with native drivers for awhile.