Hope that everyone is having a great summer so far. I am right now on my computer, and really want to overclock it to about 4.0-4.5 ghz. I right now have a Fractal Design Define Refine R4 case, which comes with air cooled fans inside. For my CPU, I have an i5-4670k cooled with the Noctua NH-D14 fan. I don't know much about over clocking, much less have experience with it, and I was simply wondering whether it is a safe thing to keep with my current cooling system and over clock, or upgrade my cooling system, or to just not over clock.