Well, i’ll install the GPU again and try it.
Just put nomodeset in /etc/default/grub right? Where all the other arguments are?
There is a long time that I don’t use grub, but as far as I remember, yes it is.
Then, run # grub-mkconfig -o /boot/grub/grub.cfg
Someone correct me if I’m wrong about the statement above pls 
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Unfortunately, nomodeset didn’t work. Put the second card back in, same issue, AMD-Vi timeout…
Oh well, time to research if i can pass the iGPU to the VM or not.
Or maybe try single GPU passthrough.