Stuttering Issues on Mac Pro 4,1->5,1 GeForce GTX 960

Discussion in 'Mac Pro' started by nownot, May 30, 2017.

  1. nownot macrumors regular

    Joined:
    Feb 25, 2007
    Location:
    tx
    #1
    I have a Mac Pro 4,1 that I flashed to 5,1 and a MSI GeForce GTX 960 using Nvidia web drivers and I've noticed, espcially on screen savers, that the video / dragging a window will stutter. Below is a video that shows the screen saver where you can see the jerky video.



    The issues persist for about 30 seconds once I login, then everything seems normal. I was wondering if anyone has any thoughts on what cold be causing this issue.

    Thanks
     
  2. thornslack macrumors 6502

    Joined:
    Nov 16, 2013
    #2
    That sounds and looks like a gpu that's running unaccelerated. I wonder if the the graphics driver is taking a moment to kick in. Didn't flashed 7xx cards display this behavior when running on OS X drivers in between nvidia updates? I sorta forget, just spitballing.
     
  3. nownot thread starter macrumors regular

    Joined:
    Feb 25, 2007
    Location:
    tx
    #3
    Im not sure how to check if its running in accelerated mode, I do have Nvidia web driver check in the system preferences.

    Also want to add that this isn't flashed. Its a generic pc card using the web drivers.
     
  4. thornslack macrumors 6502

    Joined:
    Nov 16, 2013
    #4
    To me it sounds like there's a hand off of drivers occurring. I am really no expert on this, but here's a quote on a similar topic from someone who knows more:

     
  5. owbp macrumors 6502a

    owbp

    Joined:
    Jan 28, 2016
    Location:
    Belgrade, Serbia
    #5
    I have MSI GTX 980 Gaming 4G and after leaving cMP idle for few minutes (say i have screensaver set to kick in after 10 minutes and i leave cMP idle for 5 min) i have awful lag and unaccelerated desktop for few seconds after moving the mouse. Don't know if it is in any way connected issue, but ill follow this thread for maybe possible solutions.
     

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