- Aug 4, 2017
- Dell XPS 15 9560
- HD 630
- Mobile Phone
Thanks very much for the information.That's actually expected behaviour for pretty much any laptop
On 10.13 you can set 1080p@60Hz then set 1080p HiDPI@30Hz and then set any resolution you like. I wouldn't expect to get true 60Hz that way, but at least you can use resolutions like 1440p HiDPI which is available at 60Hz only.
On 10.14 this trick doesn't work, so eGPU or TB3->DP or TB3->HDMI 2.0 adapter is only option.
I've checked that Intel HD630 supports 4K @ 60Hz through HDMI 2.0.
So I will buy an adapter to see if it works.