Ok, there are no voltage settings for the CPU or the chipset. As you increase the FSB (which inturn increases the CPU speed and ram speed) you need to add voltage to the northbridge and the vcore for the CPU itself. You also have to lower the memory divider to compensate for the FSB increase.
Can you go into the bios and see if there are additional voltage settings? Again, when the computer is booting up, just keep hitting the Delete button until the bios loads.