With the K6, AMD abandoned the PR-Rating system and went back to the standard MHz rating. No longer was there a standard Intel Pentium to compare it too with the release of the standard Pentium, Pentium Pro, and the Pentium II. Besides, the PR rating system was simply confusing potential buyers of the K6.
So what was the Original PR-Rating system...Hmmm. More data needed. Be right back.
"If you're not familiar with the "PR" concept, here's how it works. "PR" stands for "Pentium Rated," a term that became necessary when the x86 market hit the 586 generation of CPUs and the simple MHz rating lost its status as a reliable measure of performance across x86 architectures. Intel introduced the Pentium processor, which featured some important architectural enhancements over the 486, while AMD and Cyrix were still making 486s. AMD had some particularly successful 486 CPUs that were clocked much higher than any other 486 CPU and gave near-586 performance. These were their 5x86 series CPUs, which AMD sold as the 5x86 133. They were actually 486 CPUs, but they performed on-par with Pentium 75's. As a result, they were PR rated to 5x86 PR75. While the actual clock speed was higher than 75 MHz, the PR of 75 gives people an idea of what kind of performance to expect from the chip. AMD continued this PR-Rating scheme up to their K5 series, at which point they finally caved into consumer demand (and good sense) and ditched it. Cyrix, however, stuck with the PR system, and now, with the Pentium III/Athlon being the high-end of CPUs, saying your CPU is Pentium Rated to be a 333 or even a 400 is a bit of an outdated concept."
You really do need to get out more. I do more than like your idea though as Sisoft shows my T-Bird 1.4 @ 1.729 running at a pr 2300 +/- and that is really cool as this would mean that my t-bird 1.4 overclocked to 1.729 is running like a t-bird at 2300. This is really good news for me.
