'Disable CPU core to get higher overclocks?

Maybe this is not the right forum for this question. But I'm really curious about this.

If I have a CPU with 4 cores @ 3 GHz, and I disable one core in the BIOS, can I overclock to 4 GHz without changing the voltage? (Since this should not change power usage.) Of course I realize one has to consider temperatures as well.

The background is this: I work with Python, and don't need all my CPU cores, only clock speed has an influence on performance. Perhaps I can speed things up a bit this way.

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