X99 Designare EX + 6900

Hello. In a hack with these characteristics:

\ Hardware:*

CPU: 6900K

GPU: Vega 64 8GB

RAM: 64GB

Motherboard: Gigabyte X99-Designare EX

Screen(s) Number: 2

Screen(s) Resolution: FullHD + 1360x768

Audio Codec: ALC 1150

Ethernet Card: Intel Ethernet Connection (2) I218-V + Intel I211 Gigabit Network Connection

Wifi/BT Card: I ntel Dual Band Wireless-AC 8260 AC 2x2 HMC WiFi Adapter NOT USED

\ What guide/tool I followed:*

OPENCORE

\ What part I got an issue with:*

It was worked well with CATALINA

BUT, I have put an Areca 1680 RAID card and there is a big problem.

The GRAPHICS CARD does not show video. A small window appears in the center with some specks of color (I attach an image: https://imgur.com/TUolOiP).

I tryed some things:

1. I've upgraded to OC 0.8, updated the kexts, but it still doesn't work.
2. I have also changed the position of the cards, using different PCI slots, but with the same result.
3. Change SMBIOS from iMacPro 1,1 to MacPro 7.

Any ideas?

Thank you very much.

\ What files/config I am using:*

[Place a pastebin.com link with your config inside, https://pastebin.com/j6rEzCad]

[Place your EssentialsList here if possible, preferably use Google Drive https://drive.google.com/file/d/17gatPkIeQP8ujV-GEy53EGfUud_rhrog/view?usp=sharing ]