MSI Z590-A Pro Overview

I've never seen a PCIe PWR connector directly on the board itself. What is that for? Additional power supply if you're overclocking your GPU? Does it need to be connected for "regular" use?

Also, I haven't built a new PC for a long time. Do you have to plug in both 8 AND 4 pin CPU inputs or is the 8 pin enough when using an i5 or i7 without overclocking, which is what Tom's text suggests to me.
 
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