4K External Display Questions

[doggukan]

Hi to all. Im considering to buy 14" MBP and a 4K monitor with high refresh rate. i seen some good qhd ones but i just want to spend more to get better resolution for the future too.Best i coule find for the price is Gigabyte M28U.

It has DP 1.4 ,KVM functionality,minimal ghosting as per reviews and its 4K@144Hz but here is the question , can i actually plug in my mbp and get 4k at 144hz ? if yes which port should i use ?

 

[doggukan]

1 more question. if i keep my mbp connected to a wall plug, if it reaches 100% will it only draw power from power brick ? i had a dell before they had an option for that. if it only uses power brick when charged that would be great for battery life because i will be mostly connected to the charger

 

[jav6454]

MacOS will handle the battery, don't overthink it. As per monitor, I don't think 4K @ 144Hz works, unsure on this one.

 

[Amethyst1]

It has DP 1.4 ,KVM functionality,minimal ghosting as per reviews and its 4K@144Hz but here is the question , can i actually plug in my mbp and get 4k at 144hz ? if yes which port should i use ?

4K at 144 Hz via DisplayPort 1.4 requires Display Stream Compression (DSC), and I'm not sure this works for non-Apple displays once you go past macOS Catalina. But don't quote me on that. The highest refresh rate you can get without DSC is 120 Hz (if using the CVT-RBv2 timing formula; assuming a 1080 MHz pixel clock limit via four-lane HBR3), and that requires setting up a custom timing if the monitor's EDID doesn't include this mode by default, which isn't yet possible on Apple Silicon Macs.

 

[doggukan]

i dont mind 120hz if it works.i just dont want to stick on 60hz

 

[Bustycat]

4K at 144 Hz via DisplayPort 1.4 requires Display Stream Compression (DSC), and I'm not sure this works for non-Apple displays once you go past macOS Catalina. But don't quote me on that. The highest refresh rate you can get without DSC is 120 Hz (if using the CVT-RBv2 timing formula; assuming a 1080 MHz pixel clock limit via four-lane HBR3), and that requires setting up a custom timing if the monitor's EDID doesn't include this mode by default, which isn't yet possible on Apple Silicon Macs.

Pro Display XDR uses DisplayPort 1.4 with DSC.

 

[Amethyst1]

Pro Display XDR uses DisplayPort 1.4 with DSC.

Yeah. I said I'm not sure if DSC works for non-Apple displays.

i dont mind 120hz if it works.i

I've just had a look at the monitor's EDID. Its "4K" 120 Hz timing uses the CVT-RB formula, resulting in a pixel clock of 1097.75 MHz which is above the 1080 MHz limit of DisplayPort 1.4 without DSC. Thus, 120 Hz also requires DSC to work.