g-hood

yes any two molex connectors from the PSU whether they're converted from PCIE or not should work.

yep, powered directly from the PSU. no converter/barrel plug needed.

Thanks OP for such a detailed guide. I followed and bought everything of your list except for the graphic card and did a slightly different way of mounting the highpoint inside the case since my GPU is not water cooled and this involved a lot less cutting. I only have a battery powered dremel so I can't cut much at a time. Setup bootcamp Windows 10 on a Late 2013 MBPr w/ dGPU succeed without any issue. However mbp's touchpad clicks randomly in clamshell mode so I had to leave it opened. Will try to get El capitan working on this eGPU soon. Thanks again for this great write up.

Thanks for the quick guide. How did you clone the bootcamp from internal SSD to an external SSD and is this step mandatory?

Hi Guys I'm trying to build this too to run with my 2013 MBPr and noticed neither of you used this setup in a Windows OS. Do you think if it's possible to do that or there's no driver yet for Windows?