CPU Performance (AQA GCSE Computer Science): Quizzes
📚Quizzes
Practise the questions
12 questions from this quiz
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Practise the questions
12 questions from this quiz
What are the three main factors that affect CPU performance?
What are the three main factors that affect CPU performance?
Clock speed, cache size, number of cores
What unit is used to measure clock speed in modern computers?
What unit is used to measure clock speed in modern computers?
Gigahertz (GHz)
How many instructions per second can a CPU running at 4 GHz potentially process?
How many instructions per second can a CPU running at 4 GHz potentially process?
4 billion
What is the main purpose of cache memory in a CPU?
What is the main purpose of cache memory in a CPU?
To store data the CPU likely needs soon
What is a 'cache hit'?
What is a 'cache hit'?
When data is found in cache
Why does more cache memory improve CPU performance?
Why does more cache memory improve CPU performance?
CPU spends less time waiting for data
A typical laptop has 8 GB of RAM. How much cache memory might it have?
A typical laptop has 8 GB of RAM. How much cache memory might it have?
A few MB
What does having multiple processor cores allow a CPU to do?
What does having multiple processor cores allow a CPU to do?
Handle multiple tasks simultaneously
When do multiple cores NOT provide performance benefits?
When do multiple cores NOT provide performance benefits?
When software isn't written for them
What are the three steps of the Fetch-Execute cycle in order?
What are the three steps of the Fetch-Execute cycle in order?
Fetch, Decode, Execute
How does clock speed affect the Fetch-Execute cycle?
How does clock speed affect the Fetch-Execute cycle?
It affects how quickly each step happens
How does cache memory improve the Fetch-Execute cycle?
How does cache memory improve the Fetch-Execute cycle?
It reduces time to fetch instructions