Intel themselves said that running ARC on systems that don't support resizable bar is not recommended and will not give optimal performance.
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I have resizable BAR enabled tho..
Every PCIE 3.0 system has the hardware to support ReBAR/SAM, the only thing missing is the UEFI driver for it in the UEFI bios, luckly there's a project that allows users of old platforms like me to add said driver to the bios and have ReBAR working.
I run ARC card before my new ryzen system on I7-9700k, i had Asus MB and they release BIOS that supports ReBar, it wasnt that great, it shows that is isnt supportet by Intel but it work at least.
Borrow a PC from your friends for a weekend and try the GPU there.
If there's a problem with the GPU (for example it's overheating due to not sufficient die contact) then return it or RMA.
If it works then look at upgrading your PC.
Go for an X3D CPU from AMD, or wait for the new desktop CPU from Intel next year because they're going to switch motherboard sockets again.