You have to take the multiplyer and lower it in order to utilize the cpu running at 133MHz instead of 100MHz. If you have a 1.2G t-bird then you have to set the multiplyer at 9 in order for the processor to run at 1200MHz. This is not a bad thing, it will increase the t-birds performance signifacantly, and it is an overclockers dream.

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750 Athlon Classic O\C to 1090MHz (going for the 1.1G)
Water cooled pelts
Abit KA7-100
256MB Micron Running at 133MHz cas 2
Voodoo5 5500
Kenwood 72x
Sound Blaster Live Gamer
Cambridge Soundworks 5.1 Digital Speaker System
Yamaha 8\4\24 Burner
And the list goes on