PC Gamer is pooping on the Skylake-X and Threadripper party by urging prospective buyers to forget about them if their main intent is gaming. The author tested the 10-core/20-thread i9-7900X against the 4-core/8-thread Core i7-7740X and found that the latter was bested only once. He insists that gamers should go even lower with an i5-7600K, calling it the best bang for the buck. My thought is to get the best you can afford, as your rig could be up for more intensive tasks at any time.
…what can I tell you about gaming performance right now? Try this on for size: in the sixteen games I tested (charts will be coming later this week, along with a full review of Core i9-7900X and Core i7-7740X), there is only one game where the 10-core/20-thread CPU beats the 4-core/8-thread CPU – and not by a large margin. On the other hand, there are two games where the 4-core/8-thread part delivers a noteworthy victory. In other words, the two chips are basically tied for gaming performance. The difference? One costs $325, and the other costs $999.
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Source: [H]ardOCP – 10-Core Processors Are Still “Totally Overkill” for Gaming