Im trying to Overclock my CPU, and what I believe you need to do is change your CPU Clock Ratio.Mine says:CPU Clock Ratio 2.66ghz ( 133x20)I try to change the 133x20 to say, 133x21 but have no sucess, as it appears to be locked, my computer is custom built and not by HP or Dell etc, so I do not know what im doing wrong.

what's your motherboard brand & model?[/url]http://www.overclockers.com/3-step-guide-overclock-core-i3-i5-i7/

Gigabyte P55-UD3.

this video might help.

Im trying to Overclock my CPU, and what I believe you need to do is change your CPU Clock Ratio.Mine says:CPU Clock Ratio 2.66ghz ( 133x20)I try to change the 133x20 to say, 133x21 but have no sucess, as it appears to be locked, my computer is custom built and not by HP or Dell etc, so I do not know what im doing wrong.

The processor you have has a locked multipler. As such you cannot change the multiplier any higher than 21 and you must increase your Base Clock (which is 133Mhz at the stock setting).Regards,Bob