R9 280 and suddenly Monitor goes WQHD!

Discussion in 'Mac Pro' started by mrkapqa, May 14, 2018.

  1. mrkapqa macrumors member

    Joined:
    Jan 7, 2012
    Location:
    Italy, Bolzano/Bozen
    #1
    Hello ,

    today i got a MacPro 5,1 which is really great (finally!)
    and one odd thing i noticed, after installing a Radeon R9 280

    my monitor 19'' HP LP1905 Monitor with 1440x900 resolution

    shows native 2560x1600 resolution!


    That makes me think that a lot of monitors would be actually able to display higher resolutions , but for some odd reason , they don't!
     
  2. ActionableMango macrumors G3

    ActionableMango

    Joined:
    Sep 21, 2010
    #2
    With the right software you can run the OS at a higher resolution than the monitor physically can display, but it is either downsampling to fit the whole image into 1440x900 (throwing out a lot of pixels, and it will look fuzzy and small), or it is a virtual desktop with 2560x1600 size that you pan around with.

    There aren't a lot of use cases where these are better than simply running native resolution.
     
  3. mrkapqa thread starter macrumors member

    Joined:
    Jan 7, 2012
    Location:
    Italy, Bolzano/Bozen
    #3
    interesting!
    actually , all the 16:10 ratios fit-stetch the image perfectly
    the 16:9 ratios do not (the leave space)
    so actually one, even two sizes above looks nice like 1680x1050 or even 1920x1200 (tad small, though, but lot of estate)!
     

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  4. h9826790 macrumors G4

    h9826790

    Joined:
    Apr 3, 2014
    Location:
    Hong Kong
    #4
    Rendering resolution and display resolution are two different things. There is no way that your monitor can display something more than it's pixel count.

    In my case, the "Resolution" has nothing to do with the monitor resolution, it's just the rendering resolution. Obviously there is no 7680x2160 144Hz monitor on the market.
    3840x1080 HiDPI 10bit.png
     
  5. mrkapqa thread starter macrumors member

    Joined:
    Jan 7, 2012
    Location:
    Italy, Bolzano/Bozen
    #5
    i just noticed that the 16:9 are no more shown in the monitor panel - maybe the zapping of PRAM made them go away :)
    --- Post Merged, May 14, 2018 ---
    ok, i am trying to understand, but will have to sleep a night over. rendering resolution vs display resolution .

    ok, i see also that the monitor is nowhere near sharp as with native resolution , but i thought that is because it is just 19 inch anyway.
     
  6. h9826790 macrumors G4

    h9826790

    Joined:
    Apr 3, 2014
    Location:
    Hong Kong
    #6
    Unless you go for 4x native resolution (e.g. from 1920x1080 all the way to 3840x2160). Otherwise, because the rendered picture cannot fit the screen's pixels without interpolation. The image usually will look blurry.
     
  7. mrkapqa thread starter macrumors member

    Joined:
    Jan 7, 2012
    Location:
    Italy, Bolzano/Bozen
    #7
    yes, it is a bit blurry, the fonts lack sharpness, but it could also be a diminishing eyesight on my side.
    not to bad for this old TFT Monitor
    19'' now somewhat 2560x1600 :)

    (ps. when i want to upload screenshot it says )
     

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  8. h9826790, May 16, 2018
    Last edited: May 16, 2018

    h9826790 macrumors G4

    h9826790

    Joined:
    Apr 3, 2014
    Location:
    Hong Kong
    #8
    Try to make a high compression ratio jpg rather than png. The native screen capture PNG file often too large for uploading to here.

    And NO, your 19" monitor is still 1440x900. Just like your computer can play 4K (3840x2160) video on that screen at full screen mode, but the 1440x900 monitor will not show you all 3840x2160 pixel. There is a big different between "native resolution full screen mode" and "scaled resolution full screen mode".

    When you choose 2560x1440, there are about 65% of the GPU rendered pixels won't be displayed on your 1440x900 monitor. And the rest are all interpolated. Only very few of them can luckily display the exact colour to you.

    If it make you feel better, that's fine. I am also using 7680x2160 resolution on my 3840x1080 monitor because that make the text look better on my screen. But it's purely for rendering, nothing change on the monitor side.
     
  9. jclmavg macrumors regular

    jclmavg

    Joined:
    Aug 2, 2014
    #9
    Your monitor does not suddenly grow additional pixels.
     

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