[iBook] iBook 900 Processor?

[Robert Shutts]

Hello List Members:

I am trying to install something called "iCook" on my 900 mhz 14" iBook. 
  Supposedly the software allows you to control your clock speed, but 
only if you have a 750FX G3 processor.  iCook is not working in my 
machine, but I thought all the firewire G3 iBooks had the 750 FX.  Apple 
spec sheets don't say anything about the processor.  Hardware info on my 
machine says its a 750 processor.  Is this a different version of the CPU?
--