I think it's more like 14.62% if I look at his spec (Rig 1)
https://pc-builds.com/calculator/Core_i7-6800K/GeForce_RTX_2080_Ti/0IV12nlu/8/
If you upgrade to a 1080TI, you coulg get the FPS you want, without to much bottlenecking. The 1080TI is good for a smooth 1440 gaming experience.
https://pc-builds.com/calculator/Core_i7-6800K/GeForce_GTX_1080_Ti/0IV0XFlu/11/