Worst thing I did was to enable ACC. I changed ACC to AUTO and the damn thing wouldn't even post. I had to clear the CMOS via jumper.

I can do 4.0Ghz with 1.6V on water cooling Super Pi 1 Meg stable and windows stable.

Sweet spots are 3.6Ghz at default vCore to 3.8Ghz with 1.45vCore. Yet to do 3.9Ghz run.