You do know that if you're running a late version of Mojave or any version of Catalina, your Vega should run natively without any SSDT at all?
I have a secondary system running Catalina with a Vega 56 (almost the same chip) and no SSDT. And, actually it does show up in System Report -> PCI. I load WEG, yes, SSDT, no. I used to own Sapphire Nitro+ Vega 64's and I don't recall running any of
@kgp's SSDTs with it in Mojave 10.14.4 or later. Remember, those SSDT's are almost all cosmetic, and are not required to run macOS.....
Now, if you understand that these SSDTs are mostly cosmetic, and you still want to load them and adjust their slots, I'll have to leave that to someone else.....
One thing you could try is to run Hackintool, the PCI section, and if your Vega is listed there, you could export that report, and then import that specific section into Clover or OpenCore. Then when you run System Report - PCI, you'll see the Vega listed there. You may need to delete a lot of listings from the PCI report that Hackintool gives you. There's more information on Hackintool here:
https://www.tonymacx86.com/threads/release-hackintool-v2-8-6.254559/
I think the reason
@kgp put that note in there was because his Vega was water cooled, and thatr meant he could drive the temps harder than an air cooled Vega. So, don't load that
@kgp SSDT at all, and if you're trying to manage your fans better, you could try this link:
https://www.tonymacx86.com/threads/...vega-power-and-fan-control-properties.267519/
Good luck.....