Not particularly related to Rome, but what you can buy right now for a single socket system, AMD is far ahead of Intel for reasonably priced workstations or small servers with a huge amount of I/O. One threadripper CPU has 64 pci express 3.0 lanes. One lane is 985MB/s.

Working with a $399 threadripper motherboard that has four x16 physical slots, it can accommodate four Intel x710-4 10GbE four port NICs (each electrically x8), for a total of sixteen 10GbE router interfaces in a Linux kernel based FRR system, as a fully software implemented router. And with the RAM capacity of a 32GB system, no worries about FIB size. It's a very different approach to do with a routing entirely in CPU vs ASICs. But this can be built for under $4000.

Or one could just as easily use those four physical x16 slots for four independent 100GbE interfaces.