LG Ultrafine 5k and 4k on 2018 Mac Mini?

[dbtsai]

Can we connect both LG Ultrafine 5k and LG Ultrafine 4k to 2018 Mac Mini though thunderbolt 3, and use the native resolutions on both screens?

My answer is no because in 2018 Mac Mini's Intel UHD 630 GPU, it only supports three display streams, and one is hard-wired to HDMI, and LG Ultrafine 5 requires two display streams in one thunderbolt connection resulting no extra display stream for 4k monitor via thunderbolt.

If we do plug in both of the screen to Mac Mini, both screens will run in 4k mode.

However, I didn't see this issue when I actually plugin two of them to my Mac Mini via TB. Seems both of them are running the native resolutions as the following. Any thing I miss? Thanks.

 

[s_tan]

Hi, I'm thinking of connecting getting another LG 4k to connect to my LG 5k and mac mini. Would like to find out if you daisy chain the LG 4k to the LG 5k? Is there any lag to the graphic performance having to drive the two monitors? I'm currently using the blackmagic egpu connected to my mac mini to drive my LG 5k monitor.

 

[jaarso]

Hi, I'm thinking of connecting getting another LG 4k to connect to my LG 5k and mac mini. Would like to find out if you daisy chain the LG 4k to the LG 5k? Is there any lag to the graphic performance having to drive the two monitors? I'm currently using the blackmagic egpu connected to my mac mini to drive my LG 5k monitor.

I am interesting in knowing this as well. Did you get the second monitor yet?

 

[ThirteenXIII]

Video Support​

• Support for the following combination of maximum concurrent display setups:
  • Up to three displays:
    Two displays with 4096-by-2304 resolution at 60Hz connected via Thunderbolt 3 plus one display with 4096-by-2160 resolution at 60Hz connected via HDMI 2.0
  • Up to two displays:
    One display with 5120-by-2880 resolution at 60Hz connected via Thunderbolt 3 plus one display with 4096-by-2160 resolution at 60Hz connected via HDMI 2.0

Mac mini (2018) - Technical Specifications - Apple Support

support.apple.com

if that helps...

 

[s_tan]

I am interesting in knowing this as well. Did you get the second monitor yet?

not yet - will let you know when I do.

 

[Amethyst1]

Seems both of them are running the native resolutions as the following.

Unfortunately, System Information's output isn't helpful because it is not showing the physical resolution the monitors are actually running at, but the framebuffer resolution. In other words, it just says the 5K is running in 2560×1440 HiDPI (5120×2880 framebuffer resolution) and the 4K is running in 1920×1080 HiDPI (3840×2160 framebuffer resolution). To confirm whether the 5K is actually running at full 5120×2880 resolution, you can e.g. install SwitchResX and double-click the active resolution which will reveal precise timing information including the actual active physical resolution.