From WikiChip
Processor Performance Rating (P-Rating)
(Redirected from P-Rating)

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. However, the rating system was quickly dropped when K6 processors exceeded PII performance clock-for-clock.

Measuring P-Rating[edit]

Performance rating was obtained by:

  1. Obtain a representative target system that supports both the Pentium and Cyrix/IBM/AMD processor (e.g. Am5x86 / K5).
  2. Run Winstone 96 using the Pentium Processor and record the scores for the various frequencies.
  3. Defragment the hard disk after each test run
  4. Replace the Pentium processor with target processor (e.g. Am5x86).
  5. Run Winstone 96 using the target processor and record the score for this processor.
  6. 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.

Documents[edit]

Software[edit]

Models With PR[edit]

Processors With P-Rating
ModelFamilyLaunchedP-RatingFrequencyBus
AM486DX5-133V16BGCAm5x861997P75133 MHz
0.133 GHz
133,000 kHz
33 MHz
0.033 GHz
33,000 kHz
AM486DX5-133V16BHCAm5x861997P75133 MHz
0.133 GHz
133,000 kHz
33 MHz
0.033 GHz
33,000 kHz
AM486DX5-133W16BGCAm5x861997P75133 MHz
0.133 GHz
133,000 kHz
33 MHz
0.033 GHz
33,000 kHz
AM486DX5-133W16BHCAm5x861997P75133 MHz
0.133 GHz
133,000 kHz
33 MHz
0.033 GHz
33,000 kHz
AMD-K5-PR100ABQK517 June 1996P10099.99 MHz
0.1 GHz
99,990 kHz
66.66 MHz
0.0667 GHz
66,660 kHz
AMD-K5-PR100ABRK517 June 1996P10099.99 MHz
0.1 GHz
99,990 kHz
66.66 MHz
0.0667 GHz
66,660 kHz
AMD-K5-PR120ABQK57 October 1996P12090 MHz
0.09 GHz
90,000 kHz
60 MHz
0.06 GHz
60,000 kHz
AMD-K5-PR120ABRK57 October 1996P12090 MHz
0.09 GHz
90,000 kHz
60 MHz
0.06 GHz
60,000 kHz
AMD-K5-PR133ABQK57 October 1996P13399.99 MHz
0.1 GHz
99,990 kHz
66.66 MHz
0.0667 GHz
66,660 kHz
AMD-K5-PR133ABRK57 October 1996P13399.99 MHz
0.1 GHz
99,990 kHz
66.66 MHz
0.0667 GHz
66,660 kHz
AMD-K5-PR150ABRK56 January 1997P150105 MHz
0.105 GHz
105,000 kHz
60 MHz
0.06 GHz
60,000 kHz
AMD-K5-PR166ABQK56 January 1997P166116.66 MHz
0.117 GHz
116,660 kHz
66.66 MHz
0.0667 GHz
66,660 kHz
AMD-K5-PR166ABRK56 January 1997P166116.66 MHz
0.117 GHz
116,660 kHz
66.66 MHz
0.0667 GHz
66,660 kHz
AMD-K5-PR166ABXK56 January 1997P166116.66 MHz
0.117 GHz
116,660 kHz
66.66 MHz
0.0667 GHz
66,660 kHz
AMD-K5-PR200ABXK5April 1997P200133.33 MHz
0.133 GHz
133,330 kHz
66.66 MHz
0.0667 GHz
66,660 kHz
AMD-K5-PR75ABRK57 October 1996P7575 MHz
0.075 GHz
75,000 kHz
50 MHz
0.05 GHz
50,000 kHz
AMD-K5-PR90ABQK57 October 1996P9090 MHz
0.09 GHz
90,000 kHz
60 MHz
0.06 GHz
60,000 kHz
AMD-SSA/5-75ABRK527 March 1996P7575 MHz
0.075 GHz
75,000 kHz
50 MHz
0.05 GHz
50,000 kHz
AMD-SSA/5-90ABQK527 March 1996P9090 MHz
0.09 GHz
90,000 kHz
60 MHz
0.06 GHz
60,000 kHz
AMD-X5-133ADYAm5x861996P75133 MHz
0.133 GHz
133,000 kHz
33 MHz
0.033 GHz
33,000 kHz
AMD-X5-133ADZAm5x861996P75133 MHz
0.133 GHz
133,000 kHz
33 MHz
0.033 GHz
33,000 kHz
AMD-X5-133SDWAm5x861996P75133 MHz
0.133 GHz
133,000 kHz
33 MHz
0.033 GHz
33,000 kHz
AMD-X5-133SDYAm5x861996P75133 MHz
0.133 GHz
133,000 kHz
33 MHz
0.033 GHz
33,000 kHz
AMD-X5-133SDZAm5x861996P75133 MHz
0.133 GHz
133,000 kHz
33 MHz
0.033 GHz
33,000 kHz
AMD-X5-133SFWAm5x861996P75133 MHz
0.133 GHz
133,000 kHz
33 MHz
0.033 GHz
33,000 kHz
AMD-X5-133SFYAm5x861996P75133 MHz
0.133 GHz
133,000 kHz
33 MHz
0.033 GHz
33,000 kHz
AMD-X5-133SFZAm5x861996P75133 MHz
0.133 GHz
133,000 kHz
33 MHz
0.033 GHz
33,000 kHz
AMD-X5-150ADWAm5x861996P75+150 MHz
0.15 GHz
150,000 kHz
50 MHz
0.05 GHz
50,000 kHz
AMD-X5-150ADYAm5x861996P75+150 MHz
0.15 GHz
150,000 kHz
50 MHz
0.05 GHz
50,000 kHz
AMD-X5-150ADZAm5x861996P75+150 MHz
0.15 GHz
150,000 kHz
50 MHz
0.05 GHz
50,000 kHz
AMD-X5-160Am5x86P75+160 MHz
0.16 GHz
160,000 kHz
40 MHz
0.04 GHz
40,000 kHz
Count: 31
designerAMD +, IBM +, SGS-Thomson + and Cyrix +
first announcedFebruary 5, 1996 +
nameProcessor Performance Rating +, PR + and P-Rating +