@Vlad0 I think you’re missing one thing: DSDT Edit/Patch. This patch is a bit challenging if you never did DSDT/SSDT patch before, as this step is necessary to make the board able to allocate the MMIO to the cpu max supported Physical Address Size when above 4g decoding is initialized. You can examine yourself in the module AmiBoardInfo PE32 Body itself, the guide is there in the git page. Also a bit of advice, use UEFITool v0.25.0/v0.25.1 if you prefer to use uefitool method, as the latest v0.28.0 could cause pad file issues.
All in all, the shared bios i gave might be similiar to yours, but i did add Nvme boot mod, and i did update the microcodes, intel raid rom (both RST and RSTe EFI and OROM), Lan rom (both EFI and OROM), and the Intel ME Fw itself (as per mentioned before).
I don’t know any “Clover” method you use, but you can see on the post i mentioned above (in my 1st reply) where intel arc do work with this rebar mod, and this post which is another X79 chipset system.
If you have problem with intel arc, you can try this:
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if you do have another gpu that is not the most recent gpu (say, like a gt 710, or gt 1030, or rx 460), use that gpu as it supports both UEFI and Legacy after flashing the bios i gave (wether you directly flash the bios with the most recent bios, or downgrade first then straight up instant flash the modded bios i gave)
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boot up the system and go to bios, go to ACPI Option menu, find and disable “Launch CSM”, go to Pci Subsystem Settings, and enable Above 4G Decoding, then save and exit, go to bios again, and shut down the system (just press power button).
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After system is off, replace the gpu with intel arc, and boot up normally, and install the latest driver for that gpu, it should work normally… unless the gpu have a hardware problem.