You know, I think you are better off using a Clover-based version of the install for your motherboard. As I said before I had much success with my Coffee Lake build here using Clover, and everything here worked (and uses a Pascal card too) >
https://www.tonymacx86.com/threads/...sung-1tb-960-evo-nvme-nvidia-gtx-1050.249402/
Not saying you can't try Opencore, but I'm certain it will take you much longer to reach a stable working setup. There was a lot of things I had to take
out of OC before I could boot with my Z490 i9-based GTX1060 High Sierra setup.