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With the exception of the central processing unit (CPU), most hardware within a computer has two numbers that can help to determine the speed of the system. The first number is the amount of the resource provided, such as the volume of a hard drive or the capacity of the random access memory (RAM) chips.
The speed of the clock is measured in Megahertz (MHz). Well, the frequency is essentially how fast something processes in a computer. In this case(memory), it determines how fast information is going to go to your memory and back. DDR, DDR2, DDR3 memories follow the DDRxxx/PCyyyy classification.