The 5960x is way overkill for gaming. Even the i7 4790k is somewhat overkill in a lot of cases and it's literally half the processor the 5960x is. In terms of cache, the fx 8350 has 8mb l3 cache and the 5960x has 20mb l3 cache. More than just 4mb more.
In a perfect heavily threaded scenario, assuming both cpu's can be used to their full extent - a 4 core i7 already beats the fx 8350. Imagine having 8 cores and the ability to run twice as many threads as the fx.
Looking at most tasks, typical usage, the 5960x doesn't get much of a chance to show its' true potential.
http://www.bit-tech.net/hardware/2014/08/29/intel-core-i7-5960x-review/1
It takes a lot of multi threading/multi tasking to make good use of it and for the majority of tasks, speed still gives more performance than core count. Provided speed is compared on similar platforms and families, like haswell to haswell. Not amd's cpu frequency to intel's since two totally different architectures are apples and oranges.