Processor 1.4GHz 1.4GHz dual-core Intel Core i5 (Turbo Boost up to 2.7GHz) with 3MB on-chip shared L3 cache 2.6GHz 2.6GHz dual-core Intel Core i5 (Turbo Boost up to 3.1GHz) with 3MB on-chip shared L3 cache Configurable to 3.0GHz dual-core Intel Core i7 (Turbo Boost up to 3.5GHz) with 4MB on-chip shared L3 cache. 2.8GHz 2.8GHz dual-core Intel Core i5 (Turbo Boost up to 3.3GHz) with 3MB on-chip shared L3 cache Configurable to 3.0GHz dual-core Intel Core i7 (Turbo Boost up to 3.5GHz) with 4MB on-chip shared L3 cache. Storage1 1.4GHz 500GB (5400-rpm) hard drive Configurable to 1TB Fusion Drive. 2.6GHz 1TB (5400-rpm) hard drive Configurable to 1TB Fusion Drive or 256GB of flash storage (SSD). 2.8GHz 1TB Fusion Drive Configurable to 2TB Fusion Drive or 256GB, 512GB or 1TB of flash storage (SSD). Memory 1.4GHz 4GB of 1600MHz LPDDR3 memory Configurable to 8GB or 16GB. 2.6GHz 8GB of 1600MHz LPDDR3 memory Configurable to 16GB. 2.8GHz 8GB of 1600MHz LPDDR3 memory Configurable to 16GB. Graphics 1.4GHz Intel HD Graphics 5000 2.6GHz Intel Iris Graphics 2.8GHz Intel Iris Graphics Weight2 1.4GHz 2.6 pounds (1.19 kg) 2.6GHz 2.6 pounds (1.20 kg) 2.8GHz 2.7 pounds (1.22 kg) Video Support Support for up to two displays at 2560 by 1600 pixels, both at millions of colors Thunderbolt digital video output Native Mini DisplayPort output DVI output using Mini DisplayPort to DVI Adapter (sold separately) VGA output using Mini DisplayPort to VGA Adapter (sold separately) Dual-link DVI output using Mini DisplayPort to Dual-Link DVI Adapter (sold separately) HDMI video output Support for 1080p resolution at up to 60Hz Support for 3840-by-2160 resolution at 30Hz Support for 4096-by-2160 resolution at 24Hz DVI output using HDMI to DVI Adapter (sold separately) Audio Audio line in minijack (digital/analog) Audio line out/headphone minijack (digital/analog) HDMI port supports multichannel audio output Support for Apple iPhone headset with microphone Built-in speaker Communications Wi-Fi 802.11ac Wi-Fi wireless networking; IEEE 802.11a/g/b/n compatible Bluetooth Bluetooth 4.0 wireless technology Ethernet 10/100/1000BASE-T Ethernet (RJ-45 connector) Electrical and Operating Requirements Line voltage: 100-240V AC Frequency: 50Hz to 60Hz, single phase Maximum continuous power: 85W Operating temperature: 50° to 95° F (10° to 35° C) Storage temperature: -40° to 116° F (-40° to 47° C) Relative humidity: 5% to 95% noncondensing Operating altitude: tested up to 10,000 feet Typical acoustical performance:Sound pressure level (operator position): 12dBA at idle3