I've pushed CPU's for year's and several on higher VCore for extended time.
Don't overheat em I'd guess, I've always used good PSU's and CPU coolers.
I've had Mobos die from capacitors fail, I've had several different HDD's die (won't name names), I've had Ram go bad, I've yet to have a CPU die on me, my wife still uses one of my old Q9650's and refuses to upgrade it, and my sister in law still uses my old Q6600 rig I built for her.
Still have a few Xeons laying on the desk, one X5650 I have to replace in a 920 setup soon.