I created two custom profiles for resolution. Both are 3840x2160, but one is 24Hz and the other is 23,976Hz.
Reason for this is simple, I watch Bluray media on my PC and its best to view them in 1:1 FPS:Hz. In case of standard HD blurays there is no issue with this, but there is UHD...
UHD use HDR10 along with wide color gamuts, however when i use custom resolution, i am limited to 8bpp...
Connection (Display Port 1.4) isnt an issue, because lower refresh rates should not go beyond the limitations.