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Should you use a second CPU power connector?

The motherboard takes a full-size 24-pin ATX power link from the power supply, which handles most functions on the PC. Still, there's also a dedicated central processing unit (CPU) connection, usually ...
Ars Technica

4 prong CPU power connector thingey.

So you probably have noticed that some motherboards have this little CPU power connector that's completely separate from the ATX connector. I've only seen these on brand specific mobos from Dell and ...