Well, I tested it. if I inject intel in order to use quick sync, VEGA's fan will spin at high speed all the time, even opening a youtube video on Safari won't change a thing. But if I remove injectintel, and open a video of YouTube fans will spin normally! the caveat is I have to keep Safari...
We have a topic dedicated to it : https://www.tonymacx86.com/threads/post-os-x-luxmark-opencl-benchmarks.147035/
Look for it there are some Vega related benchmarks there.
I'm qouting my post from the " Post OS X Luxmark OpenCL Benchmarks" topic.
I'm getting around 15sec for BruceX. In same...
No, I'm using 17,1
and you only need to drop lilu and whatever green kexts, noting else + You are not suppose to inject ATI either.
Try to have you config.plist as clean as possible at first. step by step add necessary changes.
You don't need that lilu.kext.dsYm file, delete it. delete that whatevergreen folder as well, instead download this and unzip it and drop it there.