Sorry i meant the resolution list in the Nvidia Control panel.On windows 11 it’s just one list unfortunately. I’ve also tried doing it through the nvidia control panel with no luck. Have ordered another cable - will see tomorrow if it fixes things.
There are two resolution sections in that list. One at the top that can only be set to 60hz, and then if i scroll down to the second half of the list, there is a new sub-heading "PC", which allows 4k@120hz.