Who uses their 4K monitor at 2560x1440?

Discussion in 'Mac Accessories' started by bigpoppamac31, May 8, 2017.

  1. bigpoppamac31 macrumors 68000

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    Canada
    #1
    So I have an LG 27UD58 4K monitor and so far it's great. Takes getting used to the physical size. But right now I'm using it at 1920x1080 resolution. Not 1080p though which is also an option. But that looks horrible. But if I try to use it at 2560x1440 which I'd prefer the text isn't as sharp and clear as it is when using it at 1920x1080 or even 3840x2160. I'd never use the full 4K resolution though as everything is very tiny. But I love the 2560x1440 option. Especially using spit screen mode. If I'm using it at 1920x1080 the refresh rate is max 30hz but if I select 2560x1440 then the refresh rate option is greyed out but is says 60Hz (NTSC). Full 4K says 30Hz. Using it at 2560x1440 seems like I'm just using a display that maxes at that resolution. So it's usable but not super clear. The text looks soft. If I try to sharpen it then it looks harsh. Anyone else use their 4K monitor at 2560x1440?

    Here is my display preferences window. "Default for display" is 1920x1080.

    Screen Shot 2017-05-06 at 6.14.33 PM.png
     
  2. MrX8503 macrumors 68020

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    Sep 19, 2010
    #2
    I think many people run their 4K monitor at 2560x1440. The reason why it's not as sharp on a 27" is because it's 1.5X scaling rather than the traditional 2X retina scaling. Basically 4K isn't enough for 2X scaling on a 27" monitor.

    To get 2X scaling, you would have to run it at 1920x1080, but text would be on the large side. This is why Apple has a 4K 21" iMac. They deemed 21" to be the perfect size for 4K.

    Running it at the default or 2560x1440 resolution is up to you. If you're getting 30hz, it may be the cable or your MBP. Check out Apple's support page to verify if your model can run 4K @ 60hz. As for the cable, make sure you're using Displayport.
     
  3. bigpoppamac31 thread starter macrumors 68000

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    #3
    I'm using the DisplayPort on my 2014 rMBP 13". But it's only at 30hz. Maybe that's the issue. Would 2560x1440 be any sharper on a 24" 4K display? There's an ASUS one that looks really good. Has height and swivel adjustments as well.
     
  4. MrX8503 macrumors 68020

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    Sep 19, 2010
    #4
    It looks like you're limited by your MBP and not the cable or monitor.

    I'm not sure if 2560x1440 will be sharper on a 24", but text will certainly be smaller than what you're seeing.
     
  5. gthompson20 macrumors member

    gthompson20

    Joined:
    Jun 22, 2010
    Location:
    Indiana, USA
    #5
    To the Original Poster:
    make sure the following setting is enabled on your LG:
    HDMI ULTRA HD Deep Color

    I had to enable this setting to get 4k @ 60hz on my newer MacBook pro's that support 4k@60..> Your MacBook Pro Def only supports 4k@30 over HDMI:
    https://support.apple.com/en-us/HT206587

    Have you tried using the HDMI out of your MacBook, rather than an Adapter?
     
  6. bigpoppamac31 thread starter macrumors 68000

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    #6
    Yeah that is true. But this 27" is quite big. Going from a 13" rMBP to this is quite the adjustment. This is the 24" I was considering. https://www.amazon.com/dp/B01DHS30O...lid=3UE25CKFF25IF&coliid=I2BXRQO6QTL7AC&psc=1

    I have the Deep Colour option turned on. I have used the HDMI as well. Picture seems to look the same. Is the why the other resolution options say "low resolution" beside them?
     
  7. MrX8503 macrumors 68020

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    Sep 19, 2010
    #7
    You'd have to test out if 24" is best for you.

    Don't use HDMI, it's inferior to DP in almost every way. Besides, the HDMI port on the MBP isn't 2.0.
     
  8. bigpoppamac31 thread starter macrumors 68000

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    #8
    So I should use Mini DisplayPort to DisplayPort?
     
  9. MrX8503 macrumors 68020

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    Sep 19, 2010
    #9
    Yep
     
  10. bigpoppamac31 thread starter macrumors 68000

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    #10
    Okay. Well the LG monitor included a DisplayPort cable. Neither end is mini. Would it be better to get a cable with one end that's mini or get an adapter. I'd want one that supports 60hz even if I don't yet have a Mac which does 4K at 60hz.
     
  11. MrX8503 macrumors 68020

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    Sep 19, 2010
    #11
    I'd get the cable, but that's up to you. The beauty of DP is that it's guaranteed to support 4K @ 60hz.
     
  12. bigpoppamac31 thread starter macrumors 68000

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    #12
    Okay great. The annoying thing of this monitor though is that it will bring up a warning if you're not using the supplied cables. You can choose not to show the warning again but it's still annoying.
     
  13. badsimian macrumors newbie

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    Aug 23, 2015
    #13
    I am using a 32" 4K Benq monitor and change between 2560x1440 and the next one up depending on how tired my eyes are. Both look great to me. Perhaps not quite as pin sharp as native 2x but not enough to worry me.
     
  14. waloshin macrumors 68040

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    Oct 9, 2008
    #14
    UHD is 4 times the resolution of 1080P that is why it scales nicely on your monitor while scaling to 2560x1440 is blurry because you are not scaling evenly.
     
  15. HenryAZ macrumors 6502

    HenryAZ

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    Jan 9, 2010
    Location:
    South Congress AZ
    #15
    4k UHD 3840x2160 is best run, natively, on a 32" or larger monitor. Then you don't scale. 32" (which I have) is still a bit small for some screen elements, but you can adjust many programs to increase their text and display sizes to accommodate. I think a 36"-38" monitor would be ideal for true, unscaled 4k. The extra screen real estate at 4k is fantastic.
     
  16. waloshin macrumors 68040

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    Oct 9, 2008
    #16
    I decided on the LG 32ud59 4k monitor. So far perfect!
     

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