iMac 27-inch (Retina 5K) 3.5GHZ Quad Core i5 (Mid 2017). - Apple MNEA2LL/A. The iMac "Core i5" 3.5 27-Inch Aluminum (Retina 5K, Mid-2017/Kaby Lake) features a 14-nm "Kaby Lake" 3.5 GHz Intel "Core i5" processor (7600) with four independent processor "cores" on a single chip, a 6 MB shared level 3 cache, customize your memory and hard drive, and a Radeon Pro 575 graphics processor with 4 GB of dedicated VRAM. It also has a built-in "FaceTime HD" webcam and stereo speakers.