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Intel Pentium
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Intel Pentium
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==History== Intel's new fifth-generation chip was expected to be called the ''586'', following their earlier naming conventions. However, with the rise of [[Advanced Micro Devices|AMD]] and [[Cyrix]], Intel wanted to be able to register as a trademark the name of their new [[CPU]], as numbers cannot be trademarked. Thus, the name ''Pentium'' was born. It is now one of the most recognized trademarks in the computer world, although Intel has more or less now moved on from using it. The ''Pentium'' was the defining processor of the fifth-generation. It has, in fact, had several generations itself. The first ''Pentium'' CPUs were different, in many ways, compared to the later ones. It had been the target for compatibility for AMD's [[AMD K5|K5]] and [[Cyrix]]'s [[Cyrix 6x86|6x86]] processors, as well as generations that have followed. The chip itself is instruction set compatible with earlier [[x86]] CPUs, although it does include a few new (albeit rarely used) instructions. The ''Pentium'' provided greatly increased performance over the [[Intel 80486]] processors that preceded it, due to several architectural changes. Roughly speaking, a ''Pentium'' CPU is double the efficiency of an 80486 CPU at the same clock speed. In addition, the ''Pentium'' goes to much higher clock speeds than the 486 could ever achieve. The following are the key architectural enhancements made in the ''Pentium'' over the 80486-era CPUs (note that some of these are present in Cyrix's 5x86 processor, but that chip was developed after the ''Pentium'').
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