they are saying if you go for gaming i7 6700k doesnt have many diffrence than i5 6600k aslo if you OC the i5 6600k at 4.5Ghz vs i7 6700k 4.7Ghz the i5 6600k is almost the same does it worth ?
Since most games currently use only one thread, the performance is nearly equal between the two. Unless you are running other programs that are multi threaded, you won't see a noticeable gain in performance.