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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.
How Computer Memory Works. System RAM speed is controlled by bus width and bus speed. Bus width refers to the number of bits that can be sent to the CPU simultaneously, and bus speed refers to the number of times a group of bits can be sent each second. A bus cycle occurs every time data travels from memory to the CPU.