Quick update from me - Asus Prime X370 with BIOS 0801 booted without a problem with DOCP profile for 3200MHz CL14-14-14 RAM. So far in my limited time I've been able to get my R7 1700 up to 3.8GHz with 1.3Vcore on boxed cooler stable. Don't want to push much more as I need to wait for my AM4 mounting bracket to be able to fit my AIO
Regardless, I'm pleased with how easy it was to get the baseline up where I wanted, once decent cooler is in place, I can start my journey to 24/7 stable settings. I target realistic 4GHz all cores and some fun runs above that

BTW Ryzen feels really fast, especially in productivity applications!