Well my question is slightly different in that I'm not interested in O/C to the extreme (on air), and I think I'm right in saying the hotter a cpu runs it's life is shortened, well if you can only get 3 years out of a cpu it's no problem as you would put a higher speed cpu in, at dirt cheap prices.
So considering everything is it worth getting say a Scythe ninja at £30 compared to a retail box cooler from Intel for about £6? Well assuming intel's cooler only allows a modest O/C without heat and possible stabilty problems, is there a cooler in between say for about £12-£15 they would allow good overclocking?