The RB450G is a five port Gigabit ethernet router. Comparing to the RB450, the RB450G not only adds Gigabit speed capability, but also 256Mb of RAM, a faster CPU and a microSD card slot for file storage. The device is powered by a fast AR7161 680MHz Atheros CPU, and also includes a temperature sensor and voltage monitor. RB450 includes RouterOS - the operating system, which will turn this powerful system into a highly sophisticated router, firewall or bandwidth manager. RouterBOARD 450G with Atheros 680Mhz CPU, 256MB RAM, five Gigabit LAN, NAND Storage with RouterOS Level 5.