The RB493 has nine ethernet ports and three miniPCI slots, it also has a switch chip, so the ethernet ports of your choice can be grouped together to make it act as a switch. RB493 includes RouterOS - the operating system, which will turn this powerful system into a highly sophisticated router, firewall or bandwidth manager. With nine Ethernet ports, and three miniPCI slots, this is our most versatile RouterBOARD model. The RB493AH model includes the higher speed Atheros 680MHz CPU, more memory, and a Level5 license for more simultaneous tunnel interfaces and hotspot users. RouterBOARD 493AH with Atheros 680Mhz CPU, 128MB RAM, nine LAN, three MiniPCI, NAND Storage with RouterOS Level 5 (Wireless AP support).