The company also has introduced new internal parts to improve performance on 21-inch and 27-inch desktop computers.
The latest advancement brings 6- and 8-core processors to Retina iMac for the first time.
According to Apple, updated iMacs offer up to 60% faster CPU performance than their predecessors.
There’s also graphics performance up to 80% of the new Radeon Pro Vega GPUs fitted within the new iMac.
New iMac models carry the same Retina 4K display with support for the wide range of P3 colors, up to 1TB, and multiple ports.