1 of 1 people found this helpful
Your Samsung 55KU6400 native resolution is not 4096. It's native resolution is 3,840 × 2,160. Your TV's EDID information is saying to default at 59Hz or telling the PC what is the detectable refresh rate. If it is 60Hz it will show up as a 60Hz option in your Windows Display Settings.
If the image is rendered inches bigger than your TV panel there is a setting in your TV to adjust the image - but at 4096 it may be interpolated or upscaled because your TV's native resolution and actual pixel count is 3840x2160.