I have a working pci-passthrough setup with Dual GPU's. Arch-linux host (using a GTX 1070). The guest system (using the amd hd 6570) is a Windows 10. I am using the AsusM5a97 r2 motherboard. The motherboard has a x16 and x4 slot. The Nvidia card is in the x16 slot and the amd card is in the x4 slot. I have an option in my uefi bios for PEG/PCI primary boot device. My question is: Can i enable PCI\PEG to make the linux system boot using my secondary card (amd 6570) from the x4 slot and then use VFIO to isolate the the x16 lane (Nvidia1070) and pass-through that to the windows 10. That's pretty much all i have until I have a chance to make some room on my hard-drives for a seperate linux install for testing. So, if anyone wants me to try something for them or has any advice on what im trying to do, or has ever done this themselves, It would be awesome to hear from you.