I want to buy router for 1Gbps internet | SmallNetBuilder Forums
Numbers don?t lie?it?s time to build your own router | Ars Technica
Consumer routers that can route 1Gbps do exist but are rare. A lot of them seem to bench 1Gbps but in a real world situation, they fall flat. The consensus on internet forums seems to be:
1. Get a low end enterprise router like Ubiquiti
2. Scour eBay for used enterprise Cisco gear (I don't recommend this unless you know Cisco IOS, there is no GUI)
3. Build your own with pfSense or whatever open source router of your choice.
I went with the DIY route a long time ago and I deal with Cisco at work so I'm not familiar with consumer products but we had to upgrade our Cisco routers when we bumped our MPLS to 1Gbps.
If you have a dual gigabit NIC PC, you can find out easily. Install pfSense on a USB stick and run that as a router. A 10 year old PC should easily handle that speed. If you get full bandwidth then your router can't handle it.