Design

  • 2020 iMac: Familiar aluminium design with a black display surround 2021 iMac: New thinner design, seven different colour finishes

Displays

  • 2020 iMac: 5K 27-inch display 2021 iMac: 24-inch 4.5K display

Processor and graphics

  • 2020 iMac: Various Core i5/i7 options topped out by 3.6Ghz 10-core Core i9-10900K, AMD Radeon Pro graphics 2021 iMac: 8-core Apple M1 processor with 7 or 8 core graphics

Storage and peripherals

  • 2020 iMac: dual USB-C/Thunderbolt 3, four USB-A ports and an SD card slot 2021 iMac: Dual Thunderbolt/USB 4 ports, extra pair of USB-C ports on four-port model All iMacs come with a Magic Keyboard and Magic Mouse, 2021 iMac available with Touch ID version of Magic Keyboard

Verdict