Unit 5 Analysis 1 the Pentium Flaw

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Unit 5 Analysis 1: Pentium Flaw In this analysis I will be discussing the flaw in the Pentium microprocessors that was discovered in 1994. There was a major flaw in the division function concerning the floating-point unit or FPU. Most CPUs have a table of values stored in its permanent storage that tells the computer what values to certain division problems are. Intel did not enter the values correctly into the Pentium FPU. They omitted five entries out of about one thousand, and this caused some complex calculations to come out with a 0.06% error. The flaw was discovered by a math professor from Lynchburg College in the summer or fall of 1994. He was computing the sum of the reciprocals of a large collection of prime numbers on his Pentium based computer. As he checked his calculations, he found that they differed significantly from the theoretical values. He got correct results from running the same program on a computer with the 486 CPU, and finally tracked the problem to the Pentium itself. Intel immediately halted shipment on Pentium based computers and announced that “Common spreadsheet program, recalculating for fifteen minutes per day, could produce Pentium-related errors as often as once every 24 days.” Intel’s initial policy when the problem was first publically announced was to replace the chips for only customers who could explain their need for high accuracy in complex calculations. After a great public out-cry and Intel becoming the butt of many jokes, Intel finally announced a free replacement Pentium for any customer who asked for one. But this did not occur until late December of 1994. I do not feel that Intel’s initial response to the issue was handled correctly. It seems that Intel was hoping that this information would not be widespread because they were trying to maintain their reputation as a great computer company. They only admitted

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