MHz GHz zzzzz…..

Whenever we discuss about any system be it a laptop, a phone, a desktop we are always concerned  about the processor. How many GigaHertz is the processor? Which is the latest in the market? The higher the better?…  But what really is MHz and Ghz? And why is it so important?


Hz in MHz or GHz stands for Hertz. Its a unit of frequency and is defined as one cycle per second.325px-Wave_frequency

Hertz are commonly expressed in multiples, kilohertz (103 Hz, kHz), megahertz (106 Hz, MHz), gigahertz (109 Hz, GHz), terahertz (1012 Hz, THz), petahertz (1015 Hz, PHz), exahertz (1018 Hz, EHz), and zettahertz (1021 Hz, ZHz).

Hz = one cycle per sec, So therefore KHz = 103 Hz, That is 1000 cycles per second furthur MHz =  106 Hz That will be 1 lac cycles per sec.  Now we know what Hertz (Hz) means but what is a cycle also called as clock cycle ?


There is something called an oscillator that generates clock signals. So the time between two pulses of an oscillator  is the clock cycle. It’s basically the speed of the processor. In the early processor world the CPU executed one instruction per cycle, but with the dawn of micro-processors multiple instructions can now be executed per cycle.

So now we know what a clock cycle is, and the unit of measure. So is 1.8 GHz is better that 900 MHz ? Hmm… “The More The Better” doesn’t hold true in this case its because of the underlying architecture of the processor that also matters.

There are other factors too that affect the performance of the system like number of processors, RAM etc…

So yea that is all about Hz…. 🙂

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