Just a small correction, most of the AM4 motherboards released in 2016 and 2017 do _not_ run Zen 3. Only few vendors (I think ASRock is the only one?) added support for Zen 3 on B350 / X370 / A320. The rest only added support on B450 (2018) / X470 (2018) / B550 / X570 / A520. If you were one of the original Zen buyers in 2017, you are unfortunately limited to Zen 2 CPUs, unless if you had an ASRock motherboard.