![]() To turn a MOSFET transistor on or off, you need to transfer a certain amount of charge (aka electrons) into or out of the gate. When overclocking, you ask the transistors to switch faster. So if you can run your chip on a lower voltage, it will dissipate a lot less energy when switching, thus allowing you to switch faster before being thermally limited. ![]() However, when switching they act as varying resistors, and the amount of power dissipated in any resistor depends on the square of the applied voltage (P = V^2/R). Thus having lower internal resistance can allow you to clock higher (switch more often) before reaching the thermal limit. ![]() So there's a thermal limit to how fast they can switch. Semiconductors are constrained by the maximum junction temperature, and CMOS logic chips like modern processors primarily consume power when switching. If it has less internal resistance it will generate less heat for the same amount of work. There's no way to know from one chip to the next until you try them. Roughly, the transistors in a chip can have more or less internal resistance (Rds) due to impurities and variations during production.
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