I saw that.
Just have heard despite VT-d support some people have had problems related to BIOS support and passthrough.
I have good news to report though.
Testing passthrough of Intel 4-port NIC to pfSense VM on existing hardware: works.
Relevant specs:
Motherboard: Supermicro X11SSH-LN4F
CPU: Xeon E3-1230 v5
Hypervisor: KVM (Proxmox)
Some screenshots: