Advanced Micro Devices, the company who used the so-called "performance rating" to mark its processors in the past and who utilizes it nowadays, has reportedly decided to end this practice and adopt model numbers that resemble those that are going to be used by its rival Intel Corporation.
According to a report at HardWare.fr citing a document that seems to be an internal memo from AMD, "since AMD processors P-Rating has always be a meant to position AMD Athlon products in comparison with Intel processors and since Intel has decided to give up their CPU branding based on frequency, AMD also has to move towards a new P-Rating system. It is mandatory in order to let AMD's customers understand how AMD positions its processors. The P-ratings will be used from the third quarter 2004 and will concern only the Athlon 64 processors." AMD has always claimed officially that its "P-Rating", also known as model number, corresponds with performance estimate for AMD Athlon "Thunderbird" processor at certain frequency with specified cache.
News source: X-bit labs