Unfortelly i can't buy Ryzen. I have Pc Alienware Aurora R2 so The best option is motherboard lga 2011 to Alienware Aurora R4.I agree, extreme editions aren't meant to game, but they can if you have a mobo find a cpu for cheap.
There are different ways to measure performance, and not all will be relevant to most games. The 3960X has more cores than a 6700K, but each of the 6700K's cores can clock higher. The vast majority of games will only make full use of a limited number of threads, so those extra cores will be sitting relatively idle in most games, not contributing to performance. As a result, the higher per-core performance of the 6700K will generally provide better gaming performance.I7 3960x is better than i7 6700K 9%