Disable Pascal GPU completely

Hi there,

first hackintosh build here (Asus Z170 Maximus VIII Ranger (definetely NOT recommended!), 6700K CPU, 16GB Ram, GTX 1070).
I just got my HD 530 working again and now have the problem that my GTX 1070 which I use in Windows outputs to HDMI too. OSX is now detecting two screens and I can't set 2560x1440 @ 144Hz. My Problem seems quite unique as I didn't really find anything regarding this issue.

Any Ideas?

edit: I had this working before. Single GPU (HD 530) with the above...

Disable Pascal GPU completely