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The number of MHz tells you how fast the clock is ticking in the computer, so to speak, and the clock synchronizes the processor and other things. But the processor does not necessarily perform one instruction during one clock cycle, and some instructions do more work than others.

Old computers had some instructions that would take as many as 150 clock cycles, particular complex instructions to do floating point mathematics. Newer computers might do more than one instruction in one clock cycle.

There are eight bit (even four bit) computers, and there are 16,32 and 64 bit computers. An operation on 64 bits in one clock cycle will do eight times as much work as the same operation on 8 bits.

Some computers have operations that other computers do not have, and have to perform in software, which takes far longer.

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Q: Why is MHz not the only factor in determining how fast a computer is in a processor?
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