I notice in your post just above that you are moving somewhat toward stability but am still going to post this that I have written about the overall situation you find yourself in.
Okay let us try and do a little "understanding" of what may be going on. Whenever I see a user come in and not one dang thing about his configuration works worth a crap, then I suspect that something is truly amiss. In your situation "Bidgbob", you took an older tech motherboard and slapped a new tech cpu into it and used a much less than satisfactory power supply and then coupled it with mismatched ram. Let me put it this way, most of us that really do overclocking very regular for whatever reason, would seldom make the moves you did in configuring your system. I would expect such a configuration to have less than a 60% chance of functioning like one would expect a computer to act.
You keep referring back to the 'other' configuration you had. That configuration is null and void. The new cpu has a different IMC (intergrated memory controller) within it and can surely change how that mismatched ram may function. I see that CPUz shows your mis-matched ram running in Dual Channel. Running your mis-matched ram in dual channel would be about like you putting a 50lb bucket in one hand and a 25lb bucket in the other and walking 2 or 3 miles. You will know what mis-matched feels like then.
So I looked to see what was the overall feel of users when trying to run that power supply you have in your rig now and the prospect was n0t good at all. Okay now we have two possible situations hitting us and add to that a cpu that draws a lot of power since it gets hot and its' power needs have been spoken of plenty across the net and made many of less than gleeful at the release of the BD/FX-series of processors.
Then something in the back of my mind begin to come a little into focus. Something that I had seen months ago with an MSI mobo and why I would not recommend an MSI board to any friend. There are MSI mobos that do not handle power demands well at all. The Chipset on your mobo is nearing 3 platforms behind when the 1XXX chipsets hit with the new PileDriver desktop cpus from AMD.
WE have had users in the forum that have put FX-series processors on 8XX mobos that claim ability to use the FX-series and their overall satisfaction has not been rosey. Your board is not even using an 8XX chipset but a 7XX chipset.
Now I am not going to say for sure that you may not be able to manually adjust some voltages and maybe crutch around the ram in single channel and other things like a good power supply that you have not fixed or attended to yet but I get a gut feeling you maybe facing some issue or the other no matter what you do with the setup you have put together now and it may well be mobo and cpu related as well as not enough power today.
Take a look at that link below. Yes, I know it wanders and postulates and gets off topic a couple of times but the point I was looking for is that many MSI boards do not handle power regulation very well and the more the cpu requires...well the worse it is. That poor power regulation was what was hanging out in the back of my memory.
Crutch it and manipulate it around, the best you can, but I am betting a new motherboard is in your not to distant future if you want to run that FX-8120. Oh i searched for your type problems using FX-8150 because I did not want your thread to come up in g00gle. I was looking for the general idea to hasten my fuzzy memory recall.
Good luck to you man.
LINK>>
"Msi 760GM-P23 FX problems with FX-8150"