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From the same datasheet, you can also observe that this CPU can accept input voltages ranging from 1.2 to 1.4 V. These voltage levels, however, can actually vary within the same series of CPUs; actual values for the CPU in hand are stored in ROM on the chip, and aren't specified on the packaging or in the Spec numbers.
The lower the standard voltage of a CPU, the lower its resulting power consumption and cooling requirements.
A lower CPU voltage level generally indicates a higher-quality CPU. That's because the transistors require less voltage to change states, which also substantially raises the chances of attaining high clock rates.
The voltage level you see on your Pentium D 805 must be the same or lower for you to attain the same overclocking result we achieved or do better.