First build, I have basic understanding of whats going on but not really any experience with the bios.
I successfully "unlocked" all 4 cores. Also tried to do each of the 3 core options. However Prime95 is instant fail on two of them. Windows and IE run fine (obviously not a high load though) which is weird, I would assume if it was unstable it wouldnt boot, or not run with errors.
I upped the voltage to 1.425 didn't make much of a difference. Will messing around with the northbridge settings and/or memory make any difference?
Asus board by the way and there's a bunch of options set to "Auto" would those need to be adjusted as well?
I would examine the memory settings, make sure they match the specs for your memory. My gigabyte mobo auto setting underpowered my memory and once I corrected that prime95 ran without issues (It also had set the frequency wrong too)