Question Biostar x370 GT3

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I believe it is this one: https://www.biostar.com.tw/app/en/mb/introduction.php?S_ID=871#cpusupport
Yes it is compatible, but you may need a BIOS update prior to installing the CPU.

As for the overclock question, no one can really answer that, there are a lot of variables that affect the stability of an overclock and no CPU is the same, so they will all perform a bit differently.

That and if you're overclocking, you'll want a good quality motherboard and PSU.