Relevance of M/B Voltage

What's the relevance of the different voltages your motherboard runs at?

I upgraded my BIOS, and it reset ALL my settings from the vendor.  So I kinda had to guess my voltage.

I have  a P3-500, AX63Pro Motherboard (VIA Apollo 133).
FSB = 100Mhz
Voltage = 2 volts
Multiplier = 5.

The system is running fine, but I'm still curious as to what the voltage does.
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When Intel went to their newer chips they found that they couldn't make most of them work at the same voltage.  Just small variations.  So they required the board manufacturers to provide boards which could be adjusted to a particular chip.
If you want all the details you could go look up the data sheets at Intel.

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