Spoke too soon. I had two crashes with the offset voltage set to -0.165. And my PC wasn't doing anything strenuous at all. First crash was watching Amazon Prime using the Windows app, and the second was right clicking on the Windows start button. See, that is the danger of using offset voltages because it takes away voltage from all phases of the CPU, including idle voltage as well. So I think my idle voltage was a bit too low and that caused the crash. I have now set it to -0.150 and it seems more stable but I will monitor.niiiiiiiiiiiiiiiiiiiice, temps? and cooler
As for temps, I ran Cinebench R23 for about 5 minutes and the CPU package temp was 77c, which is significantly less than the 84c I got the last time. The cooler I'm using is a Noctua NH-U12A with a thermalright contact frame in a Fractal Design Torrent case.