AMD 45nm median voltage limits:

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That was for the AM2 Phenom II 940.

That's pretty much the entire point I was making. That doesn't just apply to one core. It's valid for all cores made on that process unless the process itself changes. It might have been tweaked over time, but I haven't seen any evidence suggesting there there has been a modification causing a significant change in maximum safe voltage.

I always take claims of "degradation" with a mountain of salt. While I know the intentions are always good, informing others of where a CPU is physically damaged, it's very difficult to objectively isolate. It's just speculation.