I just overclocked to 4ghz from 3.4ghz on my new i5 3570k, on a stock cooler, no voltage change. I read everywhere how you shouldn't do that on stock cooler, but I am getting really good temps.
I stress tested it with prime95 for 15min and hottest I got was 90C on 1 core, and 86-87 on others. I know that is high. However, when playing my fav games like skyrim or witcher 2, I am getting 75C maximum. So I shouldnt be worried right? I dont plan on doing anything more intensive than gaming anyways.