My rtx 2060 are 6700k at stock are a great match at 1440p high/ultra settings I ussuly target 45-60 fps depending on the game, but ussuly my gpu is overwhelmed before my cpu is at 100 percent in newer triple a games beacuase I ussuly favor ultra settings over more fps, in older games it would probably be the opposite. I would say for 1440p with a 6700k, get at least something with gtx 1070/1660/RX 5600 xt preformance level and at least 6 gigs of vram, but if you like ultra settings and high quality textures and are fine with 60 fps, it might be worth getting something like A rtx 2070/rx5700 xt maybe even 2080/3060, but only if you are targeting ultra settings 1440p beacuase the 6700k would bottleneck a high end gpu if you are targeting high refresh rate at like medium settings, but for 60 fps ultra 1440p the 6700k and a high end gpu will be fine together.