How can I disable graphics card?

Hey, I've installed macOS High Sierra and I don't know how I can disable the graphics card. I want to disable my graphics card because my mac can't boot even if I uncheck Inject NVIDIA or even if I check nv_disable=1 for the graphics card. How can I disable my RTX card without disabling my GT 1030, that used for the hackintosh?

PC specs:

CPU: Ryzen 5 3600

GPU 1: RTX 2070 SUPER (The card that I want to disable)

GPU 2: GT 1030 2GB

RAM: 8X2 3600Mhz

MOBO: B450M DS3H

Thank you!

Edit: my OS version is 10.13.6 (17G66), and I'm using clover.