I have personally tried OpenVPN on an EdgeRouter PoE. The OpenVPN version in the current EdgeOS is fairly old and also has zero hardware support, so like the sibling post mentioned, it kills the bandwidth. It was something like 1 Mbit for TCP and 10-15 Mbit for UDP.

>The Ubiquiti Edgerouter Lite or Edgerouter X is cheaper and able to handle gigabit network traffic, and can terminate OpenVPN

After a quick look at ubnt forums looks like it'll max out around 15mbps doing openvpn https://community.ubnt.com/t5/EdgeMAX/EdgeRouter-Pro-OpenVPN...

You can do 100Mbit IPsec on the EdgeRouter I guess, but I think last I checked the cipher support was a bit lacking.

The supermicro board with QuickAssist should easily do gigabits of IPsec.