ASUS Pro WS WRX90E-SAGE SE IOMMU group with Bifurcation

Hello community, thank you for all your passion here on the forum, I have found so many answers here to so many questions I had even thou this is my first post because I have two questions, what can’t get an answer anywhere now. In this forum I do see the only place with a potential to get an answer so I give it a try.

I want to take money into my hand again and build my next, most expensive system.

This time a AMD Ryzen™ Threadripper™ PRO 7985WX on a ASUS Pro WS WRX90E-SAGE SE motherboard. But this investment of about 12-14k USD, is also for me quite a lot of money, so I want to make sure it will fit my needs. I plan to do vfio pass through of every hardware possible to a range of KVM Domains.

So I have this questions on the ASUS Pro WS WRX90E-SAGE SE motherboard:

  1. I would really love to know what the IOMMU group listing of the Pro WS WRX90E-SAGE SE motherboard looks like.

  2. I would really love to know how the IOMMU group listing would change if I Bifurcate a PCIe 5.0 x16 slot into 4 times PCIe 5.0 x4 (in Asus terms: PCIe Raid Mode), running 4 different x4 extension cards like USB extension cards (And yes, I am aware of the lack of support of message signaled interrupts and proper resetting of most USB extension cards).

I hope someone here has the potential to answer this but anyway: Thank you all, keep up the good work!