Mac Pro (late 2010) plus 3 monitors not working

Discussion in 'Mac Pro' started by bmorris, Jan 10, 2011.

  1. bmorris macrumors 6502

    bmorris

    Joined:
    Nov 8, 2007
    Location:
    ATL
    #1
    I have the late 2010 Mac Pro with the ATI HD Radeon 5770 graphics card.
    I have 2 Apple 24" HD Cinema Displays and one 720p HDTV.
    The Apple monitors use DVI and the TV uses HDMI only.

    I have one Apple Monitor connected via DVI to DVI,
    the second is connected via Mini DP to DVI Adapter to DVI,
    and the HDTV connected via Mini DP to HDMI Adapter to HDMI.

    I called Apple and emailed Apple, they said all three monitors should work with no problems.

    I can only get 2 of the 3 monitors to show. The Mac Pro only sees 2 of the 3.
    Is there an easy fix or do I need the Dual Link Adapter, if so why?
     
  2. peskaa, Jan 10, 2011
    Last edited: Jan 10, 2011

    peskaa macrumors 68020

    peskaa

    Joined:
    Mar 13, 2008
    Location:
    London, UK
    #2
    You need active MDP to DVI adapters rather than the standard Apple ones if you want to run all three ports. Third party is fine, and much cheaper than Apple's dual-link. As to the explanation...basically, active adapters have extra circuitry in them which isn't present in standard ones. The 5770/5870 will only run triple screen (aka: Eyefinity) with active adapters, and Apple's basic adapter is "dumb" - but their dual-link one is active. However, the dual-link is also more expensive due to being dual-link as well, so is overkill. What you need is a single-link active adapter, which Apple don't make, but other people do.

    Your setup should then be:
    1) DVI to HDMI
    2) MDP to DVI (Active Adapter)
    3) MDP to DVI (Active Adapter)


    EDIT: Hold on. The 24" ACDs should connect via directly, and hence need no adapters. Do you mean the 23" ACDs, non-glossy?
     
  3. bmorris thread starter macrumors 6502

    bmorris

    Joined:
    Nov 8, 2007
    Location:
    ATL
    #3
    It's the older non glossy models.
    Can I keep my Mini DP to HDMI and just get an active Mini DP to DVI for the second 23" ACD, and have the other ACD connected just DVI?
     
  4. peskaa macrumors 68020

    peskaa

    Joined:
    Mar 13, 2008
    Location:
    London, UK
    #4
    Okay, so 23" not 24". Important to know due to the connectors ;)

    No, you can't keep the MDP to HDMI as it won't be active, unless you happened to buy an active one by chance. If you did, then yes, your setup would work.

    The thing to remember is that if you're going to use all the connections, anything plugged into MDP must be active (ie: native DP or an active adapter).
     
  5. bmorris thread starter macrumors 6502

    bmorris

    Joined:
    Nov 8, 2007
    Location:
    ATL
    #5
    not sure if it's 23" or 24"
    so i need 2 active mini dp to dvi adapters, and one dvi to hdmi adapter?
     
  6. peskaa macrumors 68020

    peskaa

    Joined:
    Mar 13, 2008
    Location:
    London, UK
    #6
    It'll be 23". Apple only used to make 20, 23 and 30" displays in the matte finish, aluminium casing design. The 24 and 27" displays are the more recent, glossy, models with the glass fronts.

    And correct, you need 2x active MDP to DVI (roughly $30 each) and a DVI to HDMI adapter (a few $). Or you could just get a DVI to HDMI cable and skip the adapter.
     
  7. bmorris thread starter macrumors 6502

    bmorris

    Joined:
    Nov 8, 2007
    Location:
    ATL
    #7
  8. peskaa macrumors 68020

    peskaa

    Joined:
    Mar 13, 2008
    Location:
    London, UK
    #8
    Done it before? Yup! I have a 5870 installed in my 2009 Mac Pro, and I have the following:
    DVI to HDMI (32" 1080p TV)
    MDP (27" ACD)
    MDP to DVI (Active, 22" 1080p Dell)

    It's only ever a limitation when filling all the display connections, and it's a really annoying one. However it is 100% ATi's fault, and there's loads of people out there complaining about it all. I did try my above setup with the MDP to DVI being Apple's cheap adapter as I have a few lying around, but it didn't work, confirming the need for an active one (and the 27" display is native MDP).

    The adapter you linked will work perfectly. ATi validated for Eyefinity means you're good to go. $30 is also better than $200 for Apple's dual-link!
     
  9. bmorris thread starter macrumors 6502

    bmorris

    Joined:
    Nov 8, 2007
    Location:
    ATL
    #9
    So I got the adapters and everything. It seems to work fine. BUT my mouse is weird now.
    The mouse cursor is a little laggy when the HDTV is on.

    I have a wireless Logitech mouse with a USB adapter, and the USB stick is attached to my keyboard.
     
  10. peskaa macrumors 68020

    peskaa

    Joined:
    Mar 13, 2008
    Location:
    London, UK
    #10
    Tried with a wired mouse? (Or any other mouse as well?)
     
  11. bmorris thread starter macrumors 6502

    bmorris

    Joined:
    Nov 8, 2007
    Location:
    ATL
    #11
    moved the usb stick to the apple monitor. seems to work fine now.
    but with the bluetooth mighty mouse, still having issues.
     

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