Clock Speed

Clock speed is the frequency of a processor's internal clock, measured in hertz and usually quoted in gigahertz (GHz). One GHz means one billion clock cycles per second, and each instruction takes one or more cycles.

Why it matters

Within the same processor design, a higher clock speed means more work per second. Across different designs it is a poor comparison, because the number of instructions completed per cycle (IPC) varies widely.

Modern chips also change frequency constantly. A base clock applies under sustained load, while a boost clock is reached briefly when power and temperature allow.

Example

A chip lists a 3.2 GHz base and 4.8 GHz boost.

3.2 GHz = 3,200,000,000 cycles per second

Under light load on one core it may reach 4.8 GHz, but with all cores busy and heat building it can fall back towards 3.2 GHz.

Common mistakes

• Comparing GHz between different CPU families or generations.
• Assuming the advertised boost clock is sustained at all times.
• Overlooking that cooling and power limits set how long boost lasts.

Related

• CPU
• Overclocking
• Thermal throttling
• CPU core

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