The Xbox Series X processor has eight custom CPU cores.
Xbox Series X uses a custom system-on-chip developed by AMD for Microsoft. Its CPU contains eight cores based on AMD’s Zen 2 microarchitecture, with a variable frequency of up to 3.8 GHz when simultaneous multithreading is disabled, or up to 3.6 GHz when it is enabled. This design was intended to deliver a substantial generational increase over the Jaguar-based processors used in Xbox One family consoles.
The Xbox Series S uses the same eight-core Zen 2 CPU design, although it has a lower CPU frequency and a less powerful graphics processor. The number eight refers to physical CPU cores, not threads, graphics compute units, or the number of cores in the GPU. Those distinctions matter because Xbox specifications often list CPU and GPU figures side by side.