The central processing unit acts as the primary logic hub of a computing system. It fetches programmed instructions from memory, decodes them, and executes arithmetic or control operations. High-performance designs integrate multiple processing cores, cache memory, and memory controllers onto a single silicon die to maximize instruction throughput and minimize latency.
The system bottleneck is the central processing unit, as it stalls while waiting for data from the slow external memory.
Hardware engineers almost always abbreviate this to CPU in speech and schematic notes, reserving the full term for formal architectural documentation.
Also heard as
- processor
Do not mix it up with
- Graphics processing unit: A central processing unit handles general-purpose sequential logic, while a graphics processing unit is optimized for highly parallel mathematical calculations.
Related terms
CPU
The central processing unit is the primary logic chip that executes instructions and coordinates system operations.
Microprocessor
An integrated circuit that contains all the functions of a central processing unit.
Arithmetic logic unit
The digital circuit block inside a processor that performs integer math and bitwise operations.
Multicore
A microprocessor architecture that places two or more independent processing units on a single integrated circuit.
System bus
A shared communication pathway that links the CPU, memory, and peripherals in a computer.