As you've read earlier, a jaw-dropping 540MHz FSB was a reality on this motherboard. Above 520MHz FSB, I had to pump in more chipset voltage than what the BIOS offered. Simple pencil voltage mods can be accomplished on this motherboard!

*Take Note that all physical Modifications Void your warranty!*

You can measure all important voltages running across the board at spots marked below, with your Multimeter.

Above area, just beside the Northbridge, is where you can pencil a resistor to increase Northbridge Voltage. Pencil the resistor above to increase the Northbridge voltage. Alternatively, you can solder on a 20K ohms Variable resistor to point shown, with other leg connected to ground. Set at Max 20K ohms, Decrease resistance to increase voltage. Going from 1.6v to 1.75v, I gained 20MHz in FSB!

Memory voltage goes up to 2.6v when you set the maximum selection in BIOS. For some die-hard overclockers, this may not be enough, especially when one is forcing CAS3 Memory performance. Below shows the Memory Voltage Mod:

Pencil the resistor above to increase the Memory voltage. Alternatively, you can solder on a 20K ohms Variable resistor to point shown, with other leg connected to ground. Set at Max 20K ohms, Decrease resistance to increase voltage.

As stated earlier, to do a GTLRef Voltage mod to improve FSB overclocking on Kentsfield, look at the spot right beside the CPU socket.

First, unsolder the resistor marked above. Then, solder a 500ohms Variable Resistor to the spot marked above, set at 100ohms, with other side of variable resistor connected to Ground. You may want to solder a wire to this spot so you can measure GTLRef 1 voltage. Now turn on your PC, and set CPU FSB voltage to maximum setting. Then as it boots up, adjust resistance of VR until GTLRef 1 Voltage reads 1.12v. That is 0.7 of the 1.6v FSB voltage, a good spot. You should see an improvement on your Kentsfield FSB Overclocking.