Kernal-Power Problem

[ncncore]

So my pc started messing about a bit the other day while gaming giving me a BSOD with the error memory management. Now it doesn't go to BSOD after updating my Bios/OC profile. However randomly it now just locks up and all I can do is restart to sort it out. I have noticed that when it locks up completely I get a Kernal-Power (43) Critical warning. Any ideas on what might be the cause?

Here are my specs -

i5 3570k
2x GTX 680's
Corsair AX 750
16Gb 1866Mhz Corsair vengeance
Windows 8.1
1 ssd
2 normal hdds usually on complete power save

OC details -

pci/cpu clock set to 100
cpu multiplier set to 42x
vcore voltage response set to fast
pwm phase control set to extreme performance
cpu voltage to normal
dvid to -0.015v
loadline calibration to medium
all power saving set to on
so now I get a vcore of 1.284v under stress (Prime 95 in extreme)

Finally here is a screen grab from the latest error, this happened while just browsing forums on the net so not even pushing anything -

 

[ncncore]

Got you! It's just annoying as the PC has been fine for over a year and now it's started to mess up.

I think I will see if there is a bios update for the mobo and reset the oc see if that sorts out the issue.

I will check the event viewer and see if there was anything else.

 

[ncncore]

Ok so I have switched my BIOS over to the stock one and everything seems completely fine now, cards running nicely, cpu sitting nicely at a 3.8Ghz and no lock ups.

So do you think it's the OC that went bad or isn';t set up correctly or the PSU can't cope, even though it has been fine for over a year?

 

[ncncore]

Oh right, I see what you're saying.

For info the mobo is a gigabyte z77x-up5 th. So not a cheap one really.

Having played a few games since putting it back to stock I have noticed no real difference in performance so may just leave, it boosts to just over 3.8Ghz anyway so 4.2 isn't that much over.