Well the PR numbers aren't really made up. Every new AthlonXP boosts the speed by 66Mhz. When you use the equation the PR number goes up by 100 points and the difference between the actual speed and the PR number increases 33 each time. AMD states that the PR numbers try to equate Palomino performance to Thunderbird performance, ie: what speed TBird would I need to equal an AthlonXP.
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