I am using 1.35 volts for a 4.5ghz overclock. I left BLCK at 100.
I have run prime 95 and Linx, both are stable. I have not run them for 24 hours however.
I might give it a go with SMP as your suggestion.
I updated to the most recent BIOS and it has not improved.
Today, the computer booted up fine.