I'm struggling to get 4096 x 2304 at 60hz using the hardware mentioned.
It works intermittently. If I unplug and replug the monitor cable, it sometimes comes back in 60hz. But then it reverts to 30hz after waking from sleep.
I've installed SwitchResX and the 60hz resolutions are just missing sometimes - see https://www.evernote.com/l/AFUEaitsECJFb59g2P7zgyefBMlpgAOLw9U
I could be imagining it, but I think it was running at 60hz reliably before my recent High Sierra upgrade.
Apple say 60hz is supported on my hardware here: https://support.apple.com/en-us/HT207447
I suspect my cable is bad. I'm using the one that came with the monitor. I've ordered another, so I'll see if that fixes it. (https://www.amazon.com/gp/product/B01CEFESRO/ref=od_aui_detailpages00?ie=UTF8&psc=1)
I notice that the shorter cables have higher bandwidth ratings, so hopefully this 3 foot cable is better than the 8 foot cable that ships with the monitor.
Has anyone else experiences this problem? Any advice?