Sudhian Media has posted an article on AMD's Model Rating System
AMD's announcement in the fall of 2001 that the new "AthlonXP" processor would eschew a standard MHz clockspeed for a model-rating system drew an Internet-wide groan from enthusiast and technical communities alike. PR (Performance Rating)-centric systems had been tried before by both CyrixRead more
and AMD, and had acquired a less-than-sterling reputation.