Eeek, I'm not Intel guru.........I can't really give you specifics. Ahhh........Why did you lower the vdimm?!
Basically you need to revert back to stock & slowly raise things. Try raising fsb in intervals of 4 or 5. It's a rather slow process at times, but it's worth the effort. I generally just slowly raise things & then run prime on torture. You shouldn't have to worry about your vdimm. Unless your memory likes less volts at certain timings & speeds, you can pretty much jack that sucker all the way up. Just like any system though, your going to have to "play" with it to see how it reacts.
Did you unlock prime95 so you can set the priority to 10?!?! Pretty pointless to run prime without a priority of 10, because it will not tax your system as much.
Sorry I can't give you more in depth help, but as I said, Intel stuff...........eekkkk.
@IMOG, hahaha. I put my real picture up as my avatar to scare people, it works! And yes, I hear folding is a good stability test as well, probably more laxed then prime would be on your system. I personally have not pondered upon the folding side of things...........To much of my own crap to do I guess. I didn't catch on to your edit till now, lmao.