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+	266	256	1266
1500+	266	256	1333
1600+	266	256	1400
1700+	266	256	1466
1800+	266	256	1533
1900+	266	256	1600
2000+	266	256	1666
2100+	266	256	1733
2200+	266	256	1800
2400+	266	256	2000
2600+	266/333	256	2133
2800+	266/333	256	2166

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