You should be able to…

  • State the purpose of the CPU
  • Describe the function of the CPU as fetching and executing instructions stored in memory
  • Explain how common characteristics of the CPU such as clock speed, cache size and number of cores affects performance


TOPIC OVERVIEW (Test your knowledge)


-The purpose of the CPU is to:

  • Process data
  • Fetch data and instructions from memory
  • Decode and execute instructions

-The function of the CPU is to fetch and decode instructions stored in memory

-The performance of the CPU depends upon the:

  • clock speed
  • amount of cache memory
  • number of processor cores

More Useful Information

The Purpose of the CPU

The Fetch Execute Cycle



Clock Speed (1) (2) (3)


Cache Memory (1) (2)

CPU Cores



Mr Clarkson Summary

Lesson Resources

Processor Research Task

CPU Quizzes

Exam Questions

CPU Exam Questions

Marking Scheme

Marking Scheme