@OhNoes

Watts = Voltage times Amps. In a computer, the voltage that the cpu gets stays pretty much the same, it draws on the 12v rail. Given that at least one variable in that equation is a constant, the power that a chip draws is proportional to the amps, the amount of current. In a high leakage and low leakage chip voltage is applied and stays the same, but the current is different for each chip. Let me explain this by the following example. You and your friend are in an open flat meadow standing 30 yards apart. If you try to whisper to your friend of course he cannot hear you, if you yell he can hear you, but he can hear you best if you cup your hands around your mouth and yell. In this example, voltage is the distance the sound has to travel, it is constant, amps is how loud you have to yell to be heard, and watts is how loud you sound to your friend. If you just yell at your friend, he will hear you (high leakage chip), but if you cup your hands around your mouth and yell, he will hear you better and louder since you are directing the sound at him instead of just in his general direction (low leakage chip). So the more and more you have to yell, the hoarser your voice will get due to strain. When you have to give more current, you produce more watts. In a cpu this extra current that is being applied to make the chip work, alot of it is wasted energy, and that is heat. Heat is a byproduct of wasted energy since the foundation of physics is based on the fact that matter cannot be created or destroyed. For the same voltage, if you have to put in less amps(current) into the chip to make it work, it will of course have lower watts than a chip that requires more amps to run. Leakage is the term being used for requiring more current and thus also creating much more heat. So when someone says high leakage chip that means that particular chip requires more amps to run than a low leakage chip. When applied to the formula W = V x A where in computers V is a constant and doesnt change, the more amps, the more Watts that will be produced.

The reason the rev C2 Phenom II X4 965 were 140w and the rev C2 Phenom II X4 955 were 125w is due to the fact that the 965s required more amps to operate at their stock speeds, and thus drew more watts. It isnt rocket science, but pure and simple Physics.