3800x - msi b450 tomahawk max
[balazs@nyestkutya ~]$ dmesg | grep IOMMU
[ 0.287457] pci 0000:00:00.2: AMD-Vi: IOMMU performance counters supported
[ 0.291006] pci 0000:00:00.2: AMD-Vi: Found IOMMU cap 0x40
[ 0.292198] perf/amd_iommu: Detected AMD IOMMU #0 (2 banks, 4 counters/bank).
[ 0.300290] AMD-Vi: AMD IOMMUv2 driver by Joerg Roedel <jroedel@suse.de>