BSOD issue with hal.dll

Hey guys, i'm getting a issue with my computer. Ever since i opened up my computer, and tried out my card in the second pci-e slot to see if i could SLI it in the case i put the graphics card i was using in the second pci-e slot, then switched it to the first slot, nothing to major. But when i booted it up, it said NEW CPU installed set up in BIOS, my computer was overclocked but set it self back to default values, which was a little strange. But that's not the issue. Ever since i've tried that i've been getting a hal.dll BSOD 0124x which to my knowleadge is a hardware complaint or failure which is bizzare to me since it worked perfect before i opened it up.

The thing is, it only happens when playing games, or anything intense graphicaly or flash player ect. Which leads me to think something is wrong with the GPU or the overclock vaules in my BIOS have got the voltage wrong and messing with my system which could be a possiblilty, but i don't see why? It worked perfect before and i reset the bios bvack to default then maunally set the values to my overclock back to normal. Anyway. The BSOD code is.

0x00000124 00000000`00000000 fffffa80`060a6028 00000000`f2000000 00000000`00000005

hal.dll hal.dll+12a3b X64 ntoskrnl.exe+7cc40


Cheers for the feedback in advance.


Edit:

System Spec:

550w coolermaster PSU
I5 760 3.8 ghz
6gb RAM 1333 mhz. Kingston.
HD 6870.
ASUS Maximus GENE III. Mobo.