First of all, thank you so much for the support and for such a quick answer. I really appreciate it.
The thing is ... following your advice I could make the screen work for 4k and 60 Hz (apparently). And I say "apparently" because on Mac OS there's a horrible lag, so It seems that the screen keeps working at 30 Hz. This is not happing on Windows 10: everything works like a charm on Windows 10. So ... I don't know ... maybe is a driver issue.
Any idea or suggestion?
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