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Adding/Using HiDPI custom resolutions

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Yes, you can do that, but HiDPI on any screen other than 5120x2880 will look **** and blurry.
 
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Yes, you can do that, but HiDPI on any screen other than 5120x2880 will look **** and blurry.
2560x1440 HiDPI looks best on a 5120x2880 display, but it still looks better than 2560x1440 Non-HiDPI on a 3840x2160 display.

1920x1080 HiDPI looks best on a 3840x2160 display, but if the display is 27 inches then things drawn on the screen seem too large - take up too much space. This is why Mirceaaa wants to use a 2560x1440 mode. He is using DisplayLink instead of a GPU, so 2560x1440 non-HiDPI might be better because less pixels will perform better over DisplayLink (if it doesn't try to scale it up to 3840x2160).
 
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Thanks everyone for your replies.

Seems like the DP -> USB C cable has done its job, here are all the resolutions I see now for the 4K monitor:

1565770953816.png

I can now also see and select 'Looks Like 2560x1440' from the Display settings and that does exactly what I need.
Also, no lag, even when scaling on 3360x1890 !

Thank you for your help!
 
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