4K at 30Hz only

I have this display, running over HDMI on a 2014 Mac Mini, and I was pretty sure in only could choose the 30hz option. However after reading this thread, and then checking monitor settings, I can see I can choose 59.88 Hertz, which I was almost certain wasn't there before. I did have the Mac Mini pulled apart last week for a routine dust cleaning, so everything was unplugged at that time, so perhaps that did the trick for me.

System Preferences Clipping (3∶14∶24 AM).png
 
tbabb said:
I have this display, running over HDMI on a 2014 Mac Mini, and I was pretty sure in only could choose the 30hz option. However after reading this thread, and then checking monitor settings, I can see I can choose 59.88 Hertz, which I was almost certain wasn't there before. I did have the Mac Mini pulled apart last week for a routine dust cleaning, so everything was unplugged at that time, so perhaps that did the trick for me.
Click to expand...
That's 60Hz for 1440p. This thread is about 4K.

When I select 1920x1080 HiDPI on my Mac mini 2018, the P2415Q connected via the Mac mini's HDMI port appears to use a mode 4K60 10bpc 4:2:0. Other HDMI modes can be 4:4:4 8bpc.

A DisplayPort connection uses 4K60 8bpc RGB. 4K60 might require MST to be disabled in the P2415Q display's menu.
 
Scrooge MacDuck said:
Wow, this thread lives on! Sorry, forgot to respond back then, - what I meant was that the same monitor wouldn't permit 4K@60Hz over DP with the same adapter.
Click to expand...
Are you talking about the Dell P2415Qb? Which adapter? Which computer/GPU?
Did you disable MST in the display menu?
 
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