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In page Performance Rating:

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However, for integer-intensive tasks which were more commonplace at the time, such as word-processing, spreadsheet editing and web browsing, the substantially lower cost of the PR-rated processors allowed the user to afford a higher-spec part. With the demise of the Cyrix MII (a renamed 6x86MX) from the market in 1999, the PR system appeared to be dead, but AMD revived it in 2001 with the introduction of its Athlon XP line of processors.