clock speed 
noun
The operating speed of a computer or its microprocessor, expressed in cycles per second (megahertz): the processor is available in 25MHz, 33MHz, and 40MHz clock speeds...
- The core clock speed and memory interface speeds of the slower cards have yet to be determined, according to the spokesman.
- After all, a clock speed of 2200 MHz should not be any sort of a problem for a 0.13 micron design.
- However the clock speed of the CPU matters much less then the video card at higher settings.
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