New BIOS on my B350 Strix seems really, really good. Before, to get 3.7GHz steady I needed about 1.3V. Now, on the new update I only need.... ahem, 1.2V.... for 3.7GHz....
Perhaps I won the silicon lottery but didn't know it because the old BIOS negative voltage offset didn't work properly..? I dunno, but these temperatures are very, very nice! This is after about 10 Cinebench runs. Can't seem to get the system to crash and HWInfo64 shows a 1.201V Vcore under load.
EDIT: Here's all the good news in a Userbenchmark run (later failed to POST with this RAM OC). Everything performing above expectations