@yhyyy: My brother has a 4770K, 1080 Ti, and he plays on a 1440p/144hz monitor. He has not complained about the CPU bottle-necking his performance. There may be certain games where it is a bottle-neck, but it is not enough where it bothers him as the frame rates are still high. G-Sync also helps to keep everything feeling smooth.
CPU bottleneck is independent of resolution. So, if a CPU is not powerful enough, it will bottleneck the same at 1920x1080 as 3440x1440.
Do not buy anything less than a GTX 1080 Ti if you are running 3440x1440 high refresh rate monitor as the GPU will be responsible for pushing the extra pixels.
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