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Isn't it fun being confidently wrong? https://iommu.info/
VT-d is a CPU function, but IOMMU groups are a function of the CPU, Chipset, and board configuration combo.
Where does it say that? On some boards you need to adjust iommu but other than that it shouldn't be a problem if the CPU supports it. I am not an expert and if I am wrong I would like you to prove it.
The previous site already shows this in practice, but here's a more technical explanation for you
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/virtualization_deployment_and_administration_guide/sect-iommu-deep-dive
Here's some more real life examples: https://forum.level1techs.com/t/vfio-passthrough-in-2023-call-to-arms/199671/18
https://old.reddit.com/r/VFIO/comments/16czih3/how_to_find_a_motherboard_with_good_iommu_groups/
Passed that you can take your skepticism somewhere else, I don't really care that you don't believe me, it doesn't change the reality of how IOMMU groups work.
Grouping has become overall better since X570, but still not a given.
Thank you