IOMMu for guest graphics passthrough works on this board! But it is purely accidental that it does! If you give up PCI3.0 NVMe , you can use the PCIe 3.0 x4 slot for the HOST graphics adapter.

The GUEST graphics adapter will be in the x16 slot.

Just make sure that your graphics adapter supports re-initialization e.g. generally not a fury card of any type). I am hopeful that ASRock will enable GPU initialization selection.

I am happy to see that my PCIe x1 graphics card does work fine, too, if it is the only graphics adapter in the system.

I aslo recommend enabling the amd programmable interrupt controller -- avic -- for stability. Enable it with a kernel boot time param; learn more here
https://www.redhat.com/archives/vfio-users/2017-March/msg00005.html

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