Hertz abbreviated Hz, is a unit of frequency. One Hz means one cycle per second. Hz is named after the German physicist Heinrich Hertz who made considerable contributions to electromagnetism.
One KHz equals 1,000 (one thousand) Hz, while 1,000,000 (one million) Hz equals one MHz, and 1,000,000,000 (one billion) Hz equals one GHz. Hopefully the table below will make it easier to understand.
|Hertz||1 Hz||0.001 kHz||0.000001 MHz|
|Kilohertz||1,000 Hz||1 kHz||0.001 MHz|
|Megahertz||1,000,000 Hz||1,000 kHz||1 MHz|
|Gigahertz||1,000,000,000 Hz||1,000,000 kHz||1,000 MHz|
For a CPU the MHz refers to the clock speed of the processor. This means that a number of bits (either 8, 16, 32, or 64) are manipulated at one million cycles per second. Sound fast?
Well that was a 1MHz CPU, (very,very slow). Now a days a 3GHz CPU is common and that means that a certain number of bits are being manipulated at 3 billion cycles per second. Now thats fast!
Common examples of megahertz are: A Pentium II CPU (300 MHz), running at 300,000,000 Hz.Or a 256MB RAM stick running at 166,000,000 Hz.