13 inch has the Sandy Bridge Intel Core i5 processor clocked at 2.3 ghz, 4GB of ram and a L2 / L3 cache. Ports include Thunderbolt , Ethernet 10/100/gigabit, Firewire 800 port, 2 USB ports, 1 SD card slot and an audio in/out port. It runs Mac OSX 10.6.6 and higher