Klart at det er et marketing stunt fra AMD, de vil ikke vedkende sig at de forsøger at sammenligne med Intel's processorer, hvilket de muligvis heller ikke gør, men det har ihvertfald forvirret en masse mennesker. I nyere tids PR, altså Thunderbird/AthlonXP æraen, var det tænkt som en sammenligning mellem TB og XP. Senere hen kun tænkt som intern sammenligning af AMD's CPU'er, groft sammenlignet det samme som Intel nu gør med deres processorer.
QuoteIn reaction to the consumers' misconception, AMD reinstalled the PR rating to compare their Athlon XP microprocessors. AMD made sure to advertise the PR number of its microprocessors rather than their raw clock speeds believing that consumers would compare the PR rating of AMD's processors to the clock speed of Intel's processors. The PR number was originally believed to show the clock speed (in megahertz} of an equivilant Pentium 4 processor, but this was never confirmed by AMD. As part of its marketing, AMD even made sure that motherboard manufacturers conspicuously showed the PR number of the microprocessor in the motherboards' POST and not include the processors' clock speeds anywhere except within the BIOS.
The use of the convention with these processors (which are rated against AMD's earlier Athlon Thunderbird cpu core) is less criticized, as the Athlon XP is a capable performer in both integer and FPU operations, and manages to out-perform an Intel Pentium 4 at a PR rating equalling the P4's MHz. The Athlon XP (as well as the Athlon 64) PR rating scheme is not intended to be anything more than a comparison to the same family of processors, and not a direct comparison to Intel or any other company's processor speeds (in raw MHz) which most skeptics say isn't true.
Kilde: Wikipedia