OPENCORE - DRM - Can't find dGPU on "Device Properties"

OpenCore 0.6.2

i9 9900K

Gigabyte designare z390

AMD RX 580 powercolor red dragon

Hey guys, Everything works flawlessly. BUT...

Gotta fix DRM.

Well, I'm trying to add "shikigva=16" on device properties, but can't find my GPU listed.

Am I doing something wrong?

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https://preview.redd.it/xz0yv7yhwhb61.png?width=1252&format=png&auto=webp&s=c5b42a2148b088f6240d4d70228c139c83f97b75