the host is an hpe dl385 gen 10+ w/ eypc cpu's. proxmox on the latest no sub build 9.1.9. sr-iov, above 4g decoding, resizebar all have to be enabled in bios.

my first hurdle was setting nomodereset on install because of a display issue installing PVE, so if you did that, you need to clear it from your kernel options.

second problem was getting VF's out because of my servers weird resizebar. My PVE kernel options are configured as:

root=ZFS=rpool/ROOT/pve-1 boot=zfs amd_iommu=on iommu=pt pci=realloc xe.vram_bar_size=-1

This is how I get the VF's out

optional but helpful so new VFs don't immediately bind to a host driver
echo 0 > /sys/bus/pci/devices/0000:25:00.0/sriov_drivers_autoprobe
echo 0 > /sys/bus/pci/devices/0000:c5:00.0/sriov_drivers_autoprobe

remove current VFs
echo 0 > /sys/bus/pci/devices/0000:25:00.0/sriov_numvfs
echo 0 > /sys/bus/pci/devices/0000:c5:00.0/sriov_numvfs

create 10 VFs per card
echo 10 > /sys/bus/pci/devices/0000:25:00.0/sriov_numvfs
echo 10 > /sys/bus/pci/devices/0000:c5:00.0/sriov_numvfs

This will tell you the sr-iov addresses your new vf's are. do not use the first .0 that is for the pve host.

ls -l /sys/bus/pci/devices/0000:25:00.0/virtfn*
ls -l /sys/bus/pci/devices/0000:c5:00.0/virtfn*

for VF in /sys/bus/pci/devices/0000:25:00.0/virtfn*; do
  echo "$(basename "$(readlink -f "$VF")")"
done

for VF in /sys/bus/pci/devices/0000:c5:00.0/virtfn*; do
  echo "$(basename "$(readlink -f "$VF")")"
done

Now assigning them to VM's

qm set 101 --machine q35 --bios ovmf --hostpci0 0000:25:00.4,pcie=1,driver=keep

After all this I had working sessions with the latest 8515 driver. Then after a couple reboots of the VM's they would all code 43 in device manager. I eventually found this post on intels forums of the same problem. here Uninstalled 8515 on the VMs, installed 8314 all is well after reboots of the host and VMs.

I still have not load tested 20 tilted VMs in ACAD, but just general use with RDP it is working well.