JM2005

Q: 27" Display Atlona AT-DP400 + ATI 5970 = 720p only?

After the wife was nice enough to pick up two of these displays I went ahead and ordered a AT-DP400. I needed this because the ATI 5970 only has 1 Mini Displayport.

After speaking the Atlona on the issue of the monitor not getting full resolution and only 720p he informed me that there is an issue with the EDID in the DP400. They are working with ATI and apple.

As of today they do not have a fix. Has anyone else ran into this issue and fixed it to work over Dual dvi to mini-Displayport?


This is on a PC (Running bootcamp with latest updates)
HIS ATI-5970 (latest drivers)


Thanks!

Posted on Dec 16, 2010 6:45 AM

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Q: 27" Display Atlona AT-DP400 + ATI 5970 = 720p only?

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  • Helpful answers

  • by mrthaibox123,

    mrthaibox123 mrthaibox123 Dec 21, 2010 1:09 PM in response to JM2005
    Level 1 (0 points)
    Dec 21, 2010 1:09 PM in response to JM2005
    YES! I have this problem too. I hget full resolution in osx and only 1280x720 in windows 7. Very very annoying.
  • by eonov,

    eonov eonov Dec 23, 2010 8:37 PM in response to JM2005
    Level 1 (0 points)
    Dec 23, 2010 8:37 PM in response to JM2005
    Hello JM2005,

    I'd like ask few quick questions.
    Do you connect the ACD to ATI 5970 directly for one Monitor ?? Dyou use a converter or such ?
    Will that also work on PC only computer ? not running bootcamp, ONLY Windows.

    Thank you for the help, much appreciated.
  • by Ashok0,

    Ashok0 Ashok0 Dec 28, 2010 5:07 PM in response to eonov
    Level 1 (10 points)
    Dec 28, 2010 5:07 PM in response to eonov
    I use my ACD27" @ 2560x1440 with the Atlona DP-400. I'm using it with a Windows only PC (No Bootcamp). But I have a nVidia GTX 260, some of the ATi 5xxx series cards are known to have problems.
  • by mrthaibox123,

    mrthaibox123 mrthaibox123 Jan 2, 2011 2:40 AM in response to JM2005
    Level 1 (0 points)
    Jan 2, 2011 2:40 AM in response to JM2005
    I get Full resolution in OS X. But in windows only 720p. I have emailed them and they are blaming ATI.

    Very annoying!
  • by i_Tim_,

    i_Tim_ i_Tim_ Jan 9, 2011 6:57 AM in response to JM2005
    Level 1 (0 points)
    Jan 9, 2011 6:57 AM in response to JM2005
    JM2005, do you have a problem when using only the one native mini display port on 5970 with one of the displays? I've changed my setup for a pc I'm building with cinema 27" and I want to use Radeon 5950 (which is basically the same card).

    Thanks
  • by JM2005,

    JM2005 JM2005 Jan 10, 2011 11:33 AM in response to i_Tim_
    Level 1 (0 points)
    Jan 10, 2011 11:33 AM in response to i_Tim_
    iTim

    I had no issues using the mini-displyport on the 5970. So for one monitor it worked great. I returned the AT-DP400 and I am using a tri-crossfire setup now. 3x5870's, one of them being a 6 port mini-display card.
  • by bassounds7,

    bassounds7 bassounds7 Jan 19, 2011 2:23 AM in response to JM2005
    Level 1 (5 points)
    Jan 19, 2011 2:23 AM in response to JM2005
    I have had good luck with the Atlona AT-HD620 to convert HDMI output from Xbox to a 27 inch LED cinema display and using a 1080p resolution. Details of how it works are summarized elsewhere. In my experience this is a superlative unit for 1080p HDMI input.
  • by Skullflower,

    Skullflower Skullflower Jan 22, 2011 6:25 AM in response to bassounds7
    Level 1 (0 points)
    Jan 22, 2011 6:25 AM in response to bassounds7
    hello together,
    i have the same problem with my windows 7 64 bit system.

    i have installed a
    PowerColor HD 5750 Low Profile 1 GB

    i use the dp400 adapter from atlona too

    i can only set a resolution of 720p

    but when i remove all ati drivers and use the standard vga graphic adapter i can choose a higher resolution of 19??x1440

    and it works

    but when i install the original driver of ati it doesnt work only 720p

    but i use the dvi-i adapter on my graphic card.

    has anyone good news for me?

    many thanks
    tim
  • by mojowozi-man,

    mojowozi-man mojowozi-man May 28, 2011 2:03 PM in response to JM2005
    Level 1 (1 points)
    May 28, 2011 2:03 PM in response to JM2005

    I am also having this issue on a 12 core macpro, 5770 series, running bootcamp. I only get 1280 x 720.

     

    Is there a fix, or do I have to take both monitors back to Apple and the dp400 back to Atlona?

     

    Seems REALLY Stupid that Apple can't even support their own monitors on their OWN computer!     

  • by turbostar,

    turbostar turbostar Jun 21, 2012 6:13 AM in response to JM2005
    Level 4 (2,925 points)
    Jun 21, 2012 6:13 AM in response to JM2005

    For what it is worth, same issue still exists and has been a year later.  MP + Apple 5870 + Atlona = 3 LED displays running full resolution under Mac OS but Atlona powered monitor only displays up to 720p under Windwos.