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Each computer has a visible structure, referred to as its architecture. The architecture of a building can be examined at various levels of detail, namely, the number of stories, the size of the rooms, and the details of door and window placement and so on. One can look at a computers architecture at similar levels of detail of basic hardware elements, which in turn depends on the type of computer (personal computer, super computer, etc.) required. Computer architecture is defined as the science of selecting and interconnecting hardware components to create computers that meet performance, functional and cost goals. It can also be described as the logical structure of the computer system. The computer architecture forms the backbone for building successful computer systems. The architecture largely precludes a computer system's quality attributes such as performance and reliability.
The processor is the main hardware that drives the computer; the faster the processor, the better the performance. From a user point of view, the most important aspect while using/purchasing a computer is its speed. The quicker a processor can process, it can handle more calculations, which means a more efficient computer system. The overall speed of a computer system is determined by several factors, most notably, the clock speed of the processor and the speed and size of the data bus. The clock speed is the rate at which the processor processes information and this is measured in millions of cycles per second (megahertz). Hence, the speed of the processor is measured in megahertz (MHz). A 700-MHz processor actually means that its clock rate is 700 million cycles per second. The more the number of hertz, the faster is the processing speed. The bus is the pathway for data communications between the processor and the various components in the computer system. The larger the bus width and the faster the bus speed, the greater the amount of data, which can travel on it in a given amount of time. Therefore, a 32-bit 800-MHz processor can potentially process 4 bytes simultaneously, 800 million cycles per second.
While purchasing a computer system, a perfect match among the bus size, bus speed and the speed of clock should be considered. For example, if someone buys a computer that can deliver data of 256 bits at a time to the processor, the processor can use only 8 bits at a time, and has a slower clock speed, and then it will not function optimally. In such a scenario, there will be a queue of data, waiting to get off the bus. This can make the computer clog, and can even corrupt the data.
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