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The hardware CPU core clock is 168 MHz while core clock is set at 53.76 MHz. Why?

Question asked by wei.jim.001 on Sep 13, 2013
Latest reply on Sep 17, 2013 by rocketdawg
I am experimenting with the discovery board for STM32F407 using Keil's training material:

On page 10 of this training document, it shows that the core clock setting in the trace tab is 53.76 MHz.  I thought this has to be the same as the CPU core clock which is 168 MHz and yet this setting works.  If I change it to 168 MHz to match the CPU core clock, it would not work (I can not see the data in Analyzer if I change to 168 MHz).  Can anyone tell me why.