Semiconductor & Computer Engineering
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Difference between revisions of "p-rating"
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* [[/IBM Microelectronics: Four companies announce new, simplified method for consumers to measure microprocessor performance in PCs]] | * [[/IBM Microelectronics: Four companies announce new, simplified method for consumers to measure microprocessor performance in PCs]] | ||
* [[/Processor Performance Rating (P-rating) Specification]] | * [[/Processor Performance Rating (P-rating) Specification]] | ||
| + | * [[:File:AMD-K5 Processor Performance Brief (June, 1996).pdf|AMD-K5 Processor Performance Brief]]; Publication #20084 Revision B/0; June, 1996. | ||
Revision as of 16:49, 21 August 2016
Processor Performance Rating (PR or P-Rating), often mistaken for "Pentium Rating", was a rating system that allowed various x86 manufacturers to gauge the performance level of their microprocessors against equivalent Pentium-level performance. PR specifications were finalized on January 25 and were introduced on February 5, 1996 in a collaborated effort by AMD, IBM, SGS-Thomson, and Cyrix to provide a way to report processor performance.
With the introduction of K6 in 1997, AMD extended this rating system by introducing PR2, comparing models against Intel's Pentium II models.
Measuring P-Rating
Performance rating was obtained by:
- Obtain a representative target system that supports both the Pentium and Cyrix/IBM/AMD processor (e.g. Am5x86 / K5).
- Run Winstone 96 using the Pentium Processor and record the scores for the various frequencies.
- Defragment the hard disk after each test run
- Replace the Pentium processor with target processor (e.g. Am5x86).
- Run Winstone 96 using the target processor and record the score for this processor.
- Compare the Winstone 96 score you get against the Pentium processors. The target processor's P-Rating is based on the highest freqeucny of the Pentium processor that the target processor's Winstone score surpasses.