If you mean 144hz, no, a HDMI connection will not carry 144hz. And for your second question, there will be quite a noticable difference in performance between the two monitors. Playing at a higher resolution means there will be a bigger workload for your GPU. If your GPU is already struggling to achieve a reasonable FPS count at medium/high settings on the games you play, you will have a hard time pushing out an extra 1612800 pixels.