Display: 27-inch (diagonal) Retina 5K display with IPS technology Processor: 3.2GHz quad core Intel Core i5 (Turbo Boost up to 3.6GHz) 3.2GHz quad core Intel Core i5 (Turbo Boost up to 3.6GHz) 3.3GHz quad core Intel Core i5 (Turbo Boost up to 3.9GHz) Memory: 8GB (two 4GB) of 1867MHz DDR3 memory; four SO-DIMM slots, user accessible Storage: 3.2GHz – 1TB (7200-rpm) hard drive 3.2GHz – 1TB Fusion Drive 3.3GHz – 2TB Fusion Drive Graphics: 3.2GHz – AMD Radeon R9 M380 graphics processor with 2GB of GDDR5 memory 3.2GHz – AMD Radeon R9 M390 graphics processor with 2GB of GDDR5 memory 3.3GHz – AMD Radeon R9 M395 graphics processor with 2GB of GDDR5 memory Wireless: Wi-Fi 802.11ac Bluetooth 4.0 Other: FaceTime HD camera 3.5 mm headphone jack SDXC card slot Four USB 3 ports (compatible with USB 2) Two Thunderbolt 2 ports 10/100/1000BASE-T Gigabit Ethernet (RJ-45 connector)