iMac

21.5-inch Retina 4K 
3.6GHz 6-core Intel Core i5 (Turbo Boost up to 4.1GHz)
8GB of 2666MHz DDR4 memory,
Configurable to 16GB or 32GB
1TB Fusion Drive
Radeon Pro 560X with 4GB of GDDR5 memory

Two Thunderbolt 3 (USB-C)