I've got a Supermicro X11SPA-TF motherboard with an Intel Xeon 6226R running Proxmox 8.1.1, and I've got a Sapphire 6600XT Nitro+ 8GB in CPU Slot 3 (x16, PCIe 3.0) and an NVIDIA 1660 Ti in CPU Slot 7 (x16, PCIe 3.0).
When I assign the NVIDIA card to a VM, it boots and works fine (tested with...