OK, time for an in depth answer. In the truist definition of the term bottleneck, no, and by that I mean, it most likely will not prevent you from playing a game....BUT, there will be slowdowns. The main loss will be minimal fps not average fps. Your minimum frames can cause severe slowdowns in games, giving you a slide show effect. Ocing your cpu can up your minimal fps, and prevent this from happening, as well possibly provide high enough fps to go to the next higher or highest in game settings, such as more eye candy, or greater AI/cpu in game usage.