- My motherboard is an ASRock M3A780GXH/128M AM3 AMD 780G
This afternoon I decided I was going to try and unlock the fourth core on my processor so I went ahead and went into the BIOS and turned on ACC setting it to Auto. I also moved my multiplier back down to 14 (default). I was able to successfully boot up and get Windows to recognize the fourth core, although it was recognizing my processor as an AMD Engineering Sample. Seeing all of this, I decided to go run a stress test through Prime95 and through the AMD OverDrive utility. When I ran the Prime95 test on all 4 threads in the Blend setting, the first three threads ran fine and the fourth received and error instantly and stopped working. When I ran it through AMD OverDrive the utility just froze up. Is my core defective or should I try increasing the voltage or something?
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Those processors were mostly defective in one core. I hated it when it was going around that most of them were unlockable. Chances are your 4th is defective like it was marketed.
You didn't get lucky. Some have a fully functional fourth core that is disabled to meet the demand of x3 chips and some are disabled because they are defective. Seems like you got a defective one.