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A register is a high-speed memory area on the CPU, which hold data and instructions currently being processed. The registers in the first PCs could hold two bytes--16 bits--each. Most CPUs sold today, for both PCs and Macintosh computers, have 64-bit registers.

The size of the registers, which is sometimes called the word size, indicates the amount of data with which the computer can work at any given time. The bigger the word size, the more quickly the computer can process a set of data. Occasionally, you will hear people refer to "32-bit processors," or "64-bit processors," or even "64-bit computers." This terminology refers to the size of the registers in the processor. If all other factors are kept equal, a CPU with 32-bit registers can process data twice as fast as one with 16-bit registers.

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Q: What is register how it effect the speed of computer?
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