AMD Graphics problems on OpenCore 0.7.0 & Big Sur 11.5.1

Hi guys,

* Hardware:

* CPU: Ryzen 7 3700X

* GPU: AMD R7 370 Series

* RAM: HyperX Fury 32 GB 3600MHz

* Motherboard: MSI B550-A pro

* Audio Codec: AppleALC

* Ethernet Card: Realtek 8111H

* Wifi/BT Card: (if available): None

* What guide/tool followed: Opencore 0.7.0 doc, Big Sur 11.5.1

* What part I got an issue with: I tried to spoof my graphics card but as you can see on the picture below it writes correctly the model name but it adds 7MB after. I don't have any hardware acceleration or whatever. It's damn slow and I want to fix it but to be honnest I almost tried everything. Does anyone has an idea ?

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https://preview.redd.it/9hr2zvb70qe71.png?width=1440&format=png&auto=webp&s=010769e93dc432d3b46f673d4a84742cc53afc8f

* What files/config I am using: config.plist and others

* Extra Info: I tried fakeATI as mentioned in the Opencore documentation and also tried to modify AMD7000Controller 18.10.10.kext and it's friend to get it work but without any success ...

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Thanks for your help !