App can't detect GPU, but system does

[pipoland]

Hi there,
I am fighting almost 1 month with a problem - it is just above my knowledge  
I use a video app which is heavily connected to a GPU.
It requires Radeon VEGA and SMBIOS iMacPro. My motherboard is quite old (X79).
On Mojave, everything works o.k. with Vega and iMacPro SMBIOS even with this old motherboard.
System Report sees the GPU, sees the video RAM, everything just works.
Except one video app (very important app for me), which can't detect GPU at all.
I friend of mine uses SSDT-X99-Vega64.aml together with WhatEverGreen.kext and this video app works for him.
My setup has different pci paths (2 times a pcibridge@0 ???) and I don't know how to modify this aml for my X79.
Here is my setup (LEFT) and original iMacPro (RIGHT).

 

I understand that SSDT-X99-Vega64.aml creates a new path for X99 
\SB.PCI0.BR3C.PEGP.EGP0.GFX0.ATIB (it is closer to iMacPro compared to my path) 
and also it adds GPU slot name, model name etc... (maybe this is important for this video app to detect my GPU?
Of course this SSDT-X99-Vega64.aml doesn't work for my X79. So the question is, how can I modify it?

I am attaching the original SSDT-X99-Vega64.aml and a decompiled version too.
Also my DSDT (not my work, I think it solves some USB issues).

Thank you for any help in advance !!!

 

(ASUS P9X79WS, i7 4930K, Vega 64 Nitro+ 8GB, Mojave, but same problem was on HighSierra 10.13.6)

SSDT-X99-Vega64.aml.zip

SSDT-X99-Vega64.dsl.zip

DSDT.aml.zip