27" 4K display refresh rate

[damkay]

Hi,

I have a question regarding connecting my MBP M3 Max and M4 Pro to an external 27" 4K display, that supports a refresh rate of let's say 120 Hz @4K. I would configure my MBPs to appear like 1440 on the 4K display. I read somewhere that MacOS actually uses a 5K image and scales it down to 4K. Does it mean I can get only 60Hz, because that's what my MBPs support for 5K or may I get 120 Hz, because that's what the MBPs support @4K?

Best regards

 

[Sheepish-Lord]

You’ll get the refresh rate at 120hz but because of the scaling you’ll get really bad PPI regardless of 4K so fonts and text will be fuzzy or grainy (less sharp).

 

[bhodinut]

Screen clip of 4K @ 120 set to 1440.