60hz 4k with Yosemite

Discussion in 'Mac Pro' started by kxfrog, Oct 24, 2014.

  1. kxfrog macrumors regular

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    Aug 9, 2009
    Location:
    UK
    #1
    Hi guys, just wanted to let everyone know that 4K displays appear to have improved support with the final release of Yosemite. The Samsung U28D590D monitor is now working for me with my 09 Mac Pro - mini DP to DP at 60hz with no artefacting or banding.
     
  2. theSeb macrumors 604

    theSeb

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    Aug 10, 2010
    Location:
    Poole, England
    #2
    I wish someone would confirm if these SST displays now work at 60 Hz on the nMP without weird artefacts on the right of the screen. The thread on this in the apple support forums suggests that it does, but....
     
  3. B1ueB1aze macrumors member

    Joined:
    Oct 22, 2013
    #3
    I have an Asus PB287Q that uses SST, and can confirm that there is no artifacts or tearing at 3840x2160@60Hz using DisplayPort 1.2 on Yosemite. This is with my 6-core Mac Pro using D500 GPUs.
     
  4. theSeb macrumors 604

    theSeb

    Joined:
    Aug 10, 2010
    Location:
    Poole, England
    #4
    Well, this is good news. What do you use the Asus for? How are you finding it? Some thoughts and impressions would be appreciated :)
     
  5. B1ueB1aze macrumors member

    Joined:
    Oct 22, 2013
    #5
    I use my Asus for graphic design, 3D modeling and photo editing. I find that it works and looks very nice. The colors are surprisingly good for a TN panel. Details look amazing on this monitor. The stand is also top notch, with great height adjustment, and being able to pivot it 90 degrees for long documents is a plus. :D
     
  6. theSeb macrumors 604

    theSeb

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    Aug 10, 2010
    Location:
    Poole, England
    #6
    I assume that you use it with a scaled resolution? How well do the scaled resolutions work, especially with text based stuff? I am trying to figure out if this monitor will be good for XCode.
     
  7. kxfrog thread starter macrumors regular

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    Aug 9, 2009
    Location:
    UK
    #7
    I'm glad to see support is now becoming widespread for 4k. However I am seeing some momentary flickering of my screen every half hour or so. The screen blanks for a fraction of a second and then comes back on.

    Is anyone else experiencing a similar issue?
     
  8. B1ueB1aze macrumors member

    Joined:
    Oct 22, 2013
    #8
    Yes, I do use it at a scaled resolution, and it works great. There are several different resolutions to scale to. Text looks amazing.
     
  9. theSeb macrumors 604

    theSeb

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    #9
    Thanks very much.
     
  10. edanuff macrumors 6502

    Joined:
    Oct 30, 2008
    #10
    I can confirm with the Samsung U28D590D that Yosemite can do 60Hz without tearing. Haven't experienced screen glitches either. If I reboot to an external drive that I have 10.9.4 installed on, I will immediately see tearing, so it's definitely a Yosemite fix, not a condition of the cables, although obviously good cables are necessary. Also, it appears that SST is a lot more stable than MST, based on my experience with the Dell UP2414Q, which had lots of screen flickers and other glitches.
     
  11. megalaser macrumors 6502

    megalaser

    Joined:
    Nov 17, 2009
    #11
    Hi, I have just bought 2 X Samsung 28 Inch 4K's for use with my 2013 Mac Pro 6 core D700 and I have to say I am rather disappointed by the performance of the monitor, I was waiting until today for Minidisplayport to display port cables to arrive and I hooked it up, the monitor runs at 60hz but I am seeing choppy video playback with lots of frame dropping. I have tried various test videos, 4K and 1080 60p and 30p, full screen and in windows but I just can't get smooth video playback on this Samsung monitor, I also have my old iMac connected in target display mode, when I drag a video window over to the iMac it runs smoothly, when I drag the window onto the Samsung 4K it drops frames and the playback is choppy. I have tried the various settings on the monitor, i.e.: Response time, standard, faster, fastest and actually it gets worse with it set to faster or fastest. The frame dropping is SLIGHTLY less if I expand a video window to full screen but any video playback is choppy and dropping frames, especially when it's a smaller window. Anyone else experienced this please? It's like there is either too slow a screen refresh to keep up with video playback or it's like a little buffer is getting full and stuttering playback. I like the monitor apart from this and the very critical sharpness setting so I hope there is a fix so I don't have to return the monitors . . . . Thanks!
     
  12. Tom-Create-Pro macrumors member

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    Oct 15, 2014
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    UK
    #12
    Which GPU are you using?
     
  13. kxfrog thread starter macrumors regular

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    Aug 9, 2009
    Location:
    UK
    #13
    Hey man, I'm using a Sapphire HD 7950 Mac card in the computer
     
  14. Pending macrumors regular

    Joined:
    Oct 1, 2014
    #14
    Seems the Sapphire 7950 Mac Edition has a history of screen flicker probs.
    http://forums.macrumors.com/showthread.php?t=1603588
     
  15. kxfrog thread starter macrumors regular

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    UK
    #15
    Thing is though, I've only noticed them under Yosemite with display port, running the display on HDMI in Mavericks i didn't get these, thinking it could be a cable issue
     

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