Re: ethernet not working when bios cpu speed to 75%
In some processors, over/under-clocking changes the CPU multiplier (i.e. the number by which you multiply the bus speed to get the CPU frequency).
So for example, if you have: 166 MHz bus X 12 (multiplier) = 2000 MHz CPU
After overclocking: 166 MHz bus x 13 (multiplier) = 2160 MHz CPU
So the CPU speed will be faster but the bus speed stays the same.
However, in Intel Atom the multipliers are fixed and it's not possible to change them. So if you want to over/under-clock the CPU speed, you will have to change the bus speed:
Normal: 166 MHz bus x 12 = 2000 MHz CPU
Overclocking: 177 MHz bus x 12 = 2133 MHz CPU
This is the reason it might work with other board but not with Fit-PC2.
More reading: http://www.webopedia.com/DidYouKnow/Com ... ocking.asp