Use Windows side by side with macOS (no restarting required) Parallels. com Dual Boot MacOS/Win 10 Pro Installed. The iMac 6-Core i5 3.1 27-Inch Aluminum (Retina 5K, 2020/Comet Lake) features a 14-nm "Comet Lake" 3.1 GHz Intel "Core i5" processor (I5-10500) with six independent processor "cores" on a single chip, a 12 MB shared level 3 cache, a T2 Security Chip and a Radeon Pro 5300 graphics processor with 4 GB of dedicated GDDR6 video memory.