I'm looking to upgrade from the FX platform to the new Ryzen 3 3300x. I've read online that B450 motherboards (which are the cheapest) will work with Zen 3 after a bios update but it's unclear whether motherboard manufacturers are releasing new motherboards with this updated bios for Zen 3 support. I don't have a ryzen chip so I will need something that works with Zen 3 out of the box.