get pci-e pass-through instructions
Do you want a visual reference or are you asking about the quality of the iommu groups?
Everything seems to work well. As observed, each GPU has its dedicated IOMMU group, and VFIO manages the R9 290X.
Which board are you using? You likely need this configuration in the initramfs settings file with options vfio_iommu_type1 allow_unsafe_interrupts = 1
The initramfs configuration file is typically located in the `/boot` directory of your ASUS Z8PE-D18 system.
Create a file at /etc/modprobe.d/vfio.conf with the necessary adjustments.