Hello,
i have a MSI RX580 Phantom OC in 2nd PCI. In the first pci there is a GTi660ti. It will not work. I have tested several roms from techpowerup.
Windows runs fine with passthrough but i need MacOS.
After one week of trying to get it run i am thinking of deleting Unraid.
Mac Os is the most important for me.
If you have just have one GPU but a iGPU i have heard that Unraid will take the iGPU and you can use the other GPU for passthrough.