If you want the processor to last 10-20 years running constantly, then perhaps 1.25V is a good limit. But really there is not going to be danger in raising the voltage above that if you plan on using the processor for its usable life span. Raising the voltage and increasing frequency are going to reduce the life span of the CPU, perhaps significantly, but it is highly unlikely that you will actually be using the CPU by the time it would die anyway.
I would recommend that you not exceed 1.40V on air cooling; as long as you stay below that you should be fine. I would try skipping to 3.8GHz and see what you can do there. Hopefully you will be able to get that stable w/ under 1.3V at load. Unless you have a golden chip 4GHz is going to be out of your reach without insane voltage.




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