In summary, the Low vs Ultra graphics setting discussion brings us to consider 1080p as the optimum screen resolution for GeForce GTX 750 when running Fortnite. The graphics settings and frame rates are as follows, Low setting: 79 FPS, Medium setting: 62 FPS, High setting: 42 FPS, Ultra setting: 30 FPS.

Yes, since HDMI on that card will allow 144fps at most.