No, it's not. The cpu pre-render frames. It can only do so, so many times a second. If it can only pre-render 100 frames a second, that's the maximum fps you can achieve in any resolution or detail setting. The gpu is bound by details and resolution, higher the details, harder the gpu works, higher the resolution the harder the gpu works. At 1080p and ultra, modern decent gpus can easily exceed that 100fps cpu limit, so the cpu is maxed but the gpu isn't. At 4k ultra, the cpu is taking a break and the gpu is suffering, cpu capable of 100fps, but the gpu can't put that many on the screen.
That said, his cpu is only capable of so many fps, doesn't matter if it's 1080p or 1440p, but if op currently isn't seeing well over 144fps in his games now at 1080p, then switching to 1440p will make it @ 1.7x as hard on the gpu, making that 165Hz a pipe dream. If 1080p is showing 140 fps, at 1440p its closer to 100fps. OP would need to be exceeding 240fps or so to get good usage out of the 165Hz monitor. The 980ti is good, but for many newer games, it's not that good at ultra settings and 140+fps