Apple 27-inch iMac with Retina 5K display: 3.8GHz quad-core Intel Core i5 Display: 27-inch (diagonal) Retina 5K display, 5120x2880 resolution with support for one billion colours, 500 nits brightness, Wide colour (P3) Processor: 3.8GHz quad�core, Intel Core i5 (Turbo Boost up to 4.2GHz) Memory: 8GB (two 4GB) of 2400MHz DDR4 memory, four SO-DIMM slots, user accessible Storage1: 2TB Fusion Drive Graphics: Radeon Pro 580 with 8GB of VRAM Operating System: macOS Sierra