Talk:Downsampling – A full guide to achieve 3840x2160 resolution – NVIDIA only/@comment-68.13.226.225-20141014232032/@comment-86.85.143.151-20141026130158

try the  2160@54 hz settings,or go lower in hz, this option worked for me by starting at 25 hz and slowly go up to see if your screen can handle it, make sure if it works to save it, and later on you can delete the the test hz res at 2160, and only keep the ones you are intrested in.

And play around once you have the desired res you want, with fron porch, and sync width vertical only, if you incease one increase the other to, sam when decreasing value., dont go to fast i have front prorch vertical on 3 and sync width vertical on 4, all other setings are the same as in the picture.

Like the document allready says go in small steps, to get the best results.