What about my 5820k (not overclocked)You have one of the fastest gaming CPU's available and you're worried about bottlenecking? Even if there was a bottleneck, there's no substantially faster CPU that you could upgrade it to, at least for as long as games aren't heavily threaded to benefit from 8-core CPU's. So there's nothing you could do even if there was a bottleneck - you would just have to live with it until tech caught up with your fps requirements.
What about my 5820k (not overclocked)