The monitor will never hinder your GPU performance, unless you change the resolution (1080p, 1440p, 4k). The difference between those two monitors is the latency, witch means how fast the monitor can process the image being sent to it from the GPU. If you do buy a 970 either get a 1440p or 1080p at 120/144Hz. Or else you'll just be wasting your money, if you only want one 1080p panel at 60Hz just get a 960, it does just fine at 1080p.