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AMD Performance Rating

A Performance Rating system is an alternative way of assessing CPU speed, instead of just looking at clockspeed.

Intel and AMD have adhered to pure MHz ratings until recently. The way an AMD CPU is designed it generally runs at lower clockspeeds than its Intel counterpart, while maintaining similar performance. This is because AMD claims their instructions per cycle (IPC) is higher, meaning that per MHz an AMD CPU ‘does more.’ While that may not be a hard concept the grasp, not everyone is aware of it. AMD revived the PR in an attempt to make the CPUs total performance more apparent. Their claim is that the PR rating on a chip denotes how fast an AMD Athlon ‘Thunderbird” processor would have to be to match the rated chip.
from: http://www.ocfaq.com/article.php/overclocking/AMD/36

rating FSB cache MHz
1400+2662561266
1500+2662561333
1600+2662561400
1700+2662561466
1800+2662561533
1900+2662561600
2000+2662561666
2100+2662561733
2200+2662561800
2400+2662562000
2600+266/3332562133
2800+266/3332562166
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