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Also, each individual CPU has a different OC potential due to the way modern CPU transistors are created on the silicon wafer. The lines are laser etched and (ideally) suppose to be of uniform depth and width. Even though the wavelength of the laser light is a standard frequency, which means the diameter of the beam and its cutting power remain within narrow tolerances, the traces it etches into the wafer are by no means highly uniform. This is due (partially) to the nature and way silicon wafers are grown. They vary in hardness and density, relative partially, to their proximity to the wafer core. When copper is placed within the trace to form a transistor, it has places within its body that vary in width (think of an hour glass shape). To over come that bottleneck in its body the transistor must not necessarily use more voltage (the amount of electrons flowing) since the bottleneck prohibits this, but increase the pushing power of the electron flow (amperes). Since modern electronics run on low voltages any way, there amperes must remain within narrow limits or they suffer adverse effects. Increasing the voltage is a simple way to overcome the above problems, however, it also increases the likelihood of instability depending on the quality of the board, CPU, memory and what not.
Also, are we talking an Athlon XP 2100? A 500Mhz OC is a big jump for that CPU.
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