The CPU (central processing unit) integrates multiple chips, including control unit (CU), arithmetic logic unit (ALU), register, cache, clock generator, etc.
The control unit is responsible for instruction decoding and execution, and the arithmetic logic unit performs arithmetic and logic operations. Registers are used to store data and instructions, and caches are used to speed up data access.
The clock generator provides a clock signal to synchronize the operation of each component. In addition, there are memory management units (MMU) for managing memory access, floating-point operations units (FPU) for performing floating-point operations, and so on. These chips work together to enable the CPU to efficiently perform various computing tasks.
Those millions, tens of millions, or even hundreds of millions are not IC chips, but transistors.