So far, assuming you are not streaming and playing a heavy CPU game there is not such thing.
CPUs are a lot more powerfull than the current software requires (that why intel is still selling 4-core CPUs that are almost the same in performance since the 2xxx generation).
Its actually hard to find any review on the 4570k at all. Probably due to the fact its a rather slower performer in benchmarks than the 3xxxx version. That does not mean the 4570k is worse, but it does mean that its definitly not much better.