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This lesson covers the three main factors that affect CPU performance: clock speed, number of cores, and cache size. These are commonly examined in AQA and OCR GCSE Computer Science.
The speed at which a CPU can process instructions determines how quickly programs run, how smoothly games play, and how fast files are processed. Three key hardware features influence this performance:
The clock speed (also called clock rate or clock frequency) measures how many instructions a CPU can process per second. It is measured in hertz (Hz).
A typical modern desktop CPU runs at between 3 GHz and 5 GHz — that means it can perform 3 to 5 billion cycles per second.
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