I picked up a 3600X and after a BIOS update it is running very well, and fast, in an Asrock AB350 Pro4 motherboard. It booted right away with no issues and it hasn’t locked up once. I am very impressed with this CPU and especially with the automatic overclocking feature. It makes manual overclocking unnecessary for most users.
I expected to buy new motherboards but decided to try my existing board since Asrock made a BIOS update available. I don’t have a need for PCIe 4.0 so this upgrade was very cost effective.