If the cores are being disabled when it's overclocked to a certain point then I would say they're being disabled for a reason. Either it's not stable and you need to boost the vcore or it could be an issue with your power supply by some means since you're drawing more power when it's overclocked and it could be disabling two of the cores to be safe.
That could not be the problem at all, but it's just my take on the situation. I would really try increasing the vcore since I would imagine it's a stability issue.
Also, exactly what voltage do you have the CPU set to right now..?
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