I'm planning to upgrade my CPU. Right now I have 4690k. I don't know if I should buy 8400 and save some money or go for the 8600k. My 4690k served me well for over 2 years. I want my new CPU to last at least 3 years. I heard the base clock don't matter at all, but what m curios about is OC on 8600k and if I later could squeeze more juice out of it.