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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.
Your computer has one or more RAM modules installed which total 256MB. 2.1GHZ. This is the computer's clock speed. The clock speed itself is not affected by other factors, such as installed RAM, but the actual speed at which the computer can process data is.