External Monitor more "Jumpy"?

Discussion in 'Mac Accessories' started by iammike1, Jul 9, 2010.

  1. iammike1 macrumors 6502a

    iammike1

    Joined:
    Oct 25, 2007
    Location:
    Columbia MD
    #1
    I have the 21.5" iMac and it's hooked up to a 23" Dell IPS panel through DVI. The Dell display is the U2311H for those who want to know.

    I have the Dell configured in a vertical orientation as the 2nd display but here's what I've noticed.

    If I grab a window and drag it around on my iMac screen, it moves very smoothly and I can drag it pretty fast with no jumpiness in the flow.

    If I then take that same window and drag it over to the Dell, the window will move in short jumps instead of smoothly unless I move the window rather slowly.

    I'm not display guru so I'm wondering what might be causing this. Is it something with the specs of the Dell display I should have been looking for and missed?
     
  2. spinnerlys Guest

    spinnerlys

    Joined:
    Sep 7, 2008
    Location:
    forlod bygningen
    #2
    It may have something to do with the GPU you have (9400M or ATI xxxx), as that Dell has 1920 x 1080 pixel and the 9400M might be a bit weak powering two monitors of that size.
     
  3. iammike1 thread starter macrumors 6502a

    iammike1

    Joined:
    Oct 25, 2007
    Location:
    Columbia MD
    #3
    I have the ATI card, I think it's like 4870 or something like that.

    I would have assumed that any drop in FPS performance would have been seen on both displays though...not just the secondary. I could be wrong though.
     

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