At the very least depending on how high of an overclock you want, get a 240mm aio cooler. 280mm would be better as would a 360mm aio. I am running currently at 4.8ghz on a Corsair H100i v2.0. When gaming Battlefield 1 the highest temps I see are 72c mostly in the upper 60s though. Was running at 5.0 but did not like the temps in the upper 70s with an occasional jump into the 80s. Actually thinking on pulling the trigger on the new Corsair 360 pro rpg.