1440p at 60Hz is about the same difficulty as 1080p 144Hz for the GPU, but 1440p 60Hz is much easier for the CPU since resolution doesn't affect CPU load. So at 1440p 60Hz the CPU only has to be capable of getting 60fps, whereas 1080p 144Hz, the load on the CPU is exactly the same, but it has to be capable of getting 144fps now. So 1080p 144Hz is "harder" in that sense as you're more likely to be limited by your CPU. But for the graphics card it's about the same.
2/4/16 at 11:45am