Well, couldn't find much stability with different NB settings. Ended up just running prime with the first settings I posted, load showed 42c. Walked downstairs to let a friend in, came back up, computer was off, and I could smell that not so familiar electronics burning smell. Went out for a few hours, thought about it, came back, tried it again - no-go. Plugged in another power supply and the board came on. Tried original power supply again, board came on again. Ran PSU calculator, and I was definitely pretty close to the limits of my oldish 600w PSU.
Ordered a 1200W Mushkin for $100. Not bad. Currently running the old PSU that was burning with stock Bios settings and everything is okay. Gonna leave it that way and not stress anything/play games till I get the new PSU and then try again.