Overclocking generally helps in most tasks that rely on processing power, as well as rendering from the GPU. Fewer chips rely on overclocking more than the 860K.
Regardless, it will bottleneck. Is that bad? That's up to you. The depth of the bottleneck is dependent on the game you play. Sometimes it might not be noticeable at all, unless you have fraps on something similar running an FPS counter. The match-up should work fine. No worries.