Display: 27-inch (diagonal) Retina 5K display Processor: 3.0GHz 6 core Intel Core i5 (Turbo Boost up to 4.1GHz) 3.1GHz 6 core Intel Core i5 (Turbo Boost up to 4.3GHz) 3.7GHz 6 core Intel Core i5 (Turbo Boost up to 4.6GHz) Memory: 8GB (two 4GB) of 2666MHz DDR4 memory; four SO-DIMM slots, user accessible Storage: 3.0GHz – 1TB Fusion Drive 3.1GHz – 1TB Fusion Drive 3.7GHz – 2TB Fusion Drive Graphics: 3.0GHz – Radeon Pro 570X with 4GB of GDDR5 memory 3.1GHz – Radeon Pro 575X with 4GB of GDDR5 memory 3.7GHz – Radeon Pro 580X with 8GB of GDDR5 memory Wireless: Wi-Fi 802.11ac Bluetooth 4.2 Other: FaceTime HD camera 3.5 mm headphone jack SDXC card slot Four USB 3 ports (compatible with USB 2) Two Thunderbolt 3 (USB-C) ports 10/100/1000BASE-T Gigabit Ethernet (RJ-45 connector)