What is the maximum resolution of the GEFORCE GTX 1080 Ti single output?

I used a driver to virtualize a monitor so that the virtual monitor can set the maximum resolution??

I saw the highest digital resolution of GTX 1080Ti at 7680x4320@60Hz on NVIDIA official website, but my virtual monitor can only be set to a maximum of 4K. Is the graphics card driver limiting the maximum resolution of single output?