CHAPTER 3A - 1 CPU o The central processing unit processes...

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1. CPU o The central processing unit processes all of the data that is accessed by the machine. In PCs the CPU, or microprocessor, is a small silicon chip located beneath the fan. Essentially, the purpose of a CPU is to process instructions through a four-part sequence of fetching, decoding, execution and writeback. Since the mid-2000s, most computers are sold with multi-core CPUs, which integrate two or more processors into one unit. In 2007, Intel built an 80-core processor that can handle a trillion operations per second. 2. RAM o Random access memory, also known as main memory, provides a buffer between the hard drive and central processing unit. When files are requested for processing, they get transferred from the hard drive to the memory. The CPU then processes the file and replaces it in the memory. The RAM provides a temporary storage that gets erased when power is removed from the machine. It is important to save modified files to the hard drive so that they get saved if power is lost.
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