iMac.

iMacs deliver maximum performance through ultra-fast Intel Core processors, a powerful Radeon Pro video card, Thunderbolt 3 (USB-C) connectivity and impressive, 43% brighter 4K and 5K displays as well as support for a billion colours.

68.58 cm (27") Retina 5K display with 5120 × 2880 pixels
54.61 cm (21.5") Retina 4K display with 4096 × 2304 pixels
Impressive 5-mm thin design
7th generation quad-core Intel Core i5 processor
Radeon Pro 570, 575 or 580 with up to 8 GB graphics memory (68.58 cm [27"] model)
Radeon Pro 555 or 560 graphics processor with up to 4 GB graphics memory (54.61 cm [21.5"] model)
Intel Iris Plus Graphics 640
Dual Thunderbolt 3 (USB-C) ports
802.11ac Wi-Fi
Magic Mouse 2
Magic Keyboard