I just deployed an OpenBSD 5.7 firewall/router/dhcp/dns using this motherboard:http://www.newegg.com/Product/Product.aspx?Item=N82E16813157417
As a side question, is that a female usb connector planted vertically right on the motherboard?
It uses the Intel Atom D2550 1.86GHz 2-Core chip and has dual 1000 Mbps Intel NICs on the motherboard. I am running the amd64 binaries on it and it's serving its purpose really well.
How hard have you pushed the network IO?