Thanks but these are only lists of CPUs and motherboards that support IOMMU, not the IOMMU groups. For me (and many others) the groupings are just as important as whether there is support at all.
The groupings are defined by the motherboard. In my experience, all motherboards that support IOMMU will put at least 1 PCIe slot in its own own group, which is good for Graphics Card passthrough. However, the grouping of other stuff like SATA controllers and NICs varies wildly between board, and that is what I am interested in.