It is a known fact that a large number of Motherboards does not allow for voltage tweaking through dip switches, jumpers or the bios or system bus speed control and instead auto detects both values. Though this is actually done with good intentions by Motherboard makers and seeks to protect your system, it makes Over Clocking your CPU impossible (Which in fact is the idea behind all of it~) Now for the bold hearted there are ways to break even this protection in select processors, unfortunately this only works for the Slot 1 processors of the Intel range but you will have to proceed with extreme caution

To do this you will need to cover some pins, which is in the Slot 1 cartridge which actually sends the signal to the bios indicating what type of voltage it requires. You will need to cover pin A121, A119, B119 in the slot, which should enable you to achieve 2.2V as your core voltage. You will have to look closely at the Cartridge to identify the right pins and you can use tape to cover the pin or break the circuit line coming into the pin (NOT ADVISED ,PROCEED WITH EXTREME CAUTION)

Be careful, as this will increase your CPU temperature. Also make sure the right pins are covered and covered correctly since if a pin is not covered properly and is still in contact there is a Risk the Bios will wrongly identify the core voltage and might assign a voltage up to 3V, which will definitely destroy it.

How to Break Over Clocking Protection of your Slot 1 CPU

There is another pin in the cartridge pin B21 that sends the signal to the Bios on whether it uses a 66MHz Bus Speed or a 100Mhz Bus speed.

You will find this pin in the backside of the slot cartridge amongst the right row of contacts. By shorting this pin the CPU will no longer send a signal that the CPU uses 66MHz and the Motherboard will automatically choose 100MHz bus speed instead.