If you don't need IDS/IPS and VPN features, only NAT, DHCP, DNS and FreeRADIUS3, passmark around 4500-5000 should be OK. (Just OK, not great.)
If IDS/IPS and VPN are needed, the passmark of i7-8700 and above is needed.
By the way, SFP+ NICs are much reliable than dual RJ45 10gbe NICs. And...