identiMac :: Model Detail - iMac 27 inch 4.0 GHz Core i7-6700K Retina 5K (Late 2015)
iMac (Retina 5K, 27-inch, Late 2015) - Technical Specifications
Specifications and performance - Apple iMac with 5K Retina display (27-inch, late 2015) review | TechRadar
Used Apple A Grade Desktop Computer iMac 27-inch (Retina 5K) 3.3GHZ Quad Core i5 (Late 2015) MK482LL/A 16 GB 1 TB HDD 5120 x 2880 Display Sierra 10.12 Includes Keyboard and Mouse - Walmart.com