This is the reason why your games may use less, more or diffent cores than they did before Windows 10. Because of DX12 the games might utilize diffent or less cores depending on the game itself. Also some games cannot utilize more than four cores. Because of this, some games acctually benifit from using non hyperthreaded cores and disable them. To demonstrate this in a benchmark, logical cores 0 and 1 will offer much less performance than logical cores 0 and 3, because logical cores 0 and 3 are on two distinct physical CPUs, where as logical cores 0 and 1 share certain computational units and caches. So, logical cores 0 and 1 form a pair, 2 and 3 form a pair, etc. Thus, the key point is to be aware that these pairs of logical cores exist, and if one of the two cores in a pair is utilized, it will dramatically impact the performance of the other core. Newer generation Intel processors pair their logical cores in a mechanism similar to AMD's, where each pair share certain physical resources.
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