I run this board MX45GM2 with a Core 2 Duo T6570 as my Firewall/Router run squid, and tcpdump for network analyzing among other services. Never had an issue with it. A P4 while it will do the job is a power hog. If your only intention is analyzing and want to go that route, them I am positive an Intel Atom will suffice. There are several manufacturers that make Atom boards with dual Intel LAN.