All i was ever saying is that temps and voltage will both degrade a CPU. You seem to think only voltage will degrade a CPU.
I provided an article that agrees that it is not "safe" to overclock even without voltage increase.
Why would you do something which is unsafe to a machine you rely on to make money?
Im all for overclocking on gaming/personal computers. I've overclocked every CPU/GPU i have ever owned. I have personally burned out CPU's/Mobos over the years pushing the limits so i know first hand how unsafe of a practice it is, and would never do it on a machine i relied on to make money. Either on a large corporate scale or even at home.
No, I said that over-volting with over-clocking is an order of a magnitude more degrading to a CPU than just a mild over-clock.
And the article never says that mild OCing is not safe. It just says it can degrade the chip
theoretically by the way of higher temps, which are more affected in this case by room temperature anyway. A Core i5 2500 at 3.6GHz with 67C full load temp and one at 3.3GHz with 65C full load temp should both last over 20 years. If you're worried about it, buy a cheap air cooler. That will decrease temps by more than 10C and may make you feel better about the chip lasting 40 years instead of 30.
I would do this to a machine which I rely on because it would increase efficiency and because the theoretical degradation of the CPU will be way after it has to be replaced, if there's any. I'm certainly not gonna worry about the chip needing higher voltage to run in 30 years, if it needs it at all.
As for your personal experience, that's why the article says that you should make mild over-volts if you're an enthusiast that wants his CPU to last a good time before it degrades. If you do this, you may have the chance of running the machine that way for five years or more before you have to push higher voltage through it. If you don't know when to stop, that's your problem.
I'd heavily advise people that administer and service the computers themselves in their home or home business to do a mild OC with no additional voltage if it's a recent CPU. It will increase efficiency by a good amount with no side effects, apart from very slightly higher temps.