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CPU Speed

There are many components inside the CPU. The CPU clock keeps the working of the components synchronized. By striking each clock a certain amount of work is done. Heart bit in our body is an example of clock tick in computer.

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The unit used for clock speed is megahertz. Hertz means 1 clock tick per second. So ‘Mega’ ‘Hertz’ means 1 million (106) clock tick per second.

Megahertz is the measure of speed of the processor. A microcomputer's speed mostly depends on the processor. So a faster clock means a faster computer.

But this is not hundred percent true. A computer's speed depends on various other things such as memory size, motherboard, bus speed etc.

So increasing only CPU speed by 50% does not make an overall increase of computer’s speed by 50%, it may increase by 20%. Nowadays, the slowest computer you may find will be 25 or 33 MHz 386DX. The fastest speed you’ll hear may get up around 400 MHz Pentium II.

3.4. Word Size

Word size determines how much big a number the computer can operate in one operation. The larger the word size, the bigger the number. Unit of word size is bit. Today most of the processors support 32-bit word size. The largest integer number that a processor with 32-bit word size can manipulate is 232-1. A processor with larger word size is faster than a processor with smaller word size.