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G41 PCI Express Frequency Set Backs To 100 (Default) After Shut Down / Power Off

I've G41M-Combo REV 2.0 Board With Updated FB BIOS.
As We Know, We Required To Inc^ PCI Express Freq. From The M.B.I. Tweaker Section Of BIOS For Overclocking CPU Host Freq. More Than 344MHz.

I Need To Overclock My Core2Duo E8400 (E0 9X Multiplier) Upto 3.4GHz (378MHz CPU Host).

Q1. WHY I've Not Got Success Without Touching PCI Express Freq. ?

Q2. WHY I'm Getting Success Only Upto 3.22GHz Even After Increasing PCI Express Freq. More ?

Q3. WHY The PCI Express Freq. Values Sets Back To 100 (Default) After Shut Down / Power Off The System ?

NOTE- I'M NOT USING ANY EXTERNAL VIDEO CARD CURRENTLY