Macs and dpi issues

[eldergeek]

We’ve just bought two Dell U4025QW’s, panel wise they’re great and the MacBook Pros (M2 Pro and M4 Pro) can drive them over thunderbolt at 3840x1620 hi-dpi 120hz. Downside is that both monitors have coil whine when on standby and the dell logos on both are stuck on wrong, which is mildly irritating considering the price!

Annoyingly I’d hoped to run my older Samsung J791 34” as a daisy chained monitor but connected this way the M4 Pro Mac can’t do the combination of 3840x1620 120hz and 3440x1440 100hz on the Samsung. Only options even with 3rd party tools like displaymate seem to be stuck on 60hz on the Dell and either 5k resolution or one lower than 3840x1620, which is odd and not hi-dpi.

I take it you have it daisy chained? and they both run at 120hz?

 

[pioneer2000]

I take it you have it daisy chained? and they both run at 120hz?

No, the Dell will only do 120hz on its own via thunderbolt 4 to the Mac. With the Samsung daisy chained the Dell will do 5k but only at 60hz, whilst the Samsung will do 100hz. Bit odd but nothing I change gives me any other options.

 

[nlel1975]

No, the Dell will only do 120hz on its own via thunderbolt 4 to the Mac. With the Samsung daisy chained the Dell will do 5k but only at 60hz, whilst the Samsung will do 100hz. Bit odd but nothing I change gives me any other options.

Just out of curiosity what does your System Report say your resolution and UI is?

Here's mine...

 

[pioneer2000]

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