I honestly can't think of a reason to want to use the stock cooler on a high end cpu like the 8700 on a permanent basis.... After dishing out a hundreds of $/€ for a CPU. You whould want to save up 30-40 $/€ for a cheap closed loop water-cooling or a mediocre air cooler that whould net you a better thermal exchange. Resulting in better performance and longer life of your components. Heat is not your friend when it comes to longevity and possible stability of your system. The stock cooler will result in thermal throttling on continuios high loads, and less time of the CPU stepping up to specified turbo frequencies. Also do keep in mind if you build a PC your temperatures will be affected by, the closed case, other components and ofc ambient temperature.