A new report from Bloomberg cites sources close to Apple who say that Apple is on track to introduce Macs running Apple-made CPUs and GPUs in 2021. The chips the company is developing are codenamed Kalamata.

While there have been previous reliable reports that Apple is doing this, today’s article goes into much more detail than before on both Apple’s strategy and the basic architecture of the chips. Its sources say that Apple is working on three different systems-on-a-chip for Macs, and all of them will be based on the A14 chip the company has developed for the next flagship iPhones.

The initial wave of Mac chips will have eight high-performance cores and four energy-efficient ones—codenamed Firestorm and Icestorm, respectively. Apple is looking into introducing chips with more cores in later products, it seems.