Standard: 21.5-inch LED-backlit IPS display with 1920 x 1080 resolution. Retina 4K: 21.5-inch Retina display with 4096 x 2304 resolution and P3 wide color gamut. Processor: Base: 1.6GHz dual-core Intel Core i5 (Turbo Boost up to 2.7GHz). Mid/High: 2.8GHz or 3.1GHz quad-core Intel Core i5 (Turbo Boost up to 3.3GHz or 3.6GHz). Memory: 8GB of 1867MHz LPDDR3 onboard memory, configurable to 16GB only at the time of purchase; it cannot be upgraded later. Storage: Typically equipped with a slow 1TB 5400-rpm hard drive, though some units feature a Fusion Drive or SSD. Graphics: Integrated Intel HD Graphics 6000 or Intel Iris Pro Graphic Connectivity & Ports Rear Ports: Includes a 3.5mm headphone jack, SDXC card slot, four USB 3 ports, two Thunderbolt 2 ports, and Gigabit Ethernet. Wireless: 802.11ac Wi-Fi and Bluetooth 4.0.
