Dual monitor problems.

Discussion in 'Mac Pro' started by BigMac77, May 10, 2008.

  1. BigMac77 macrumors newbie

    BigMac77

    Joined:
    Apr 27, 2008
    Location:
    Az
    #1
    I've got a Power Mac running dual 20" cinema displays (sort of). It runs hella slow with both hooked up, and iTunes runs crappy. If I unhook one, it runs fine. I've got dual 1.8 processors and 3 GB of RAM. Anyone have any ideas what's wrong?
     
  2. ASFx macrumors regular

    Joined:
    Feb 24, 2008
    #2
    I'd guess that the video card in your power mac is being put under a lot of strain with two 20 inch monitors. Maybe you could try adding a 2nd video card and plugging your 2nd monitor into that instead.
     
  3. BigMac77 thread starter macrumors newbie

    BigMac77

    Joined:
    Apr 27, 2008
    Location:
    Az
    #3
    It is running two videocards. One ATI Radeon x800 and one 9200.
     
  4. aaronw1986 macrumors 68030

    Joined:
    Oct 31, 2006
    #4
    And the monitors are hooked up to a different video card? If so, then whichever one you are unhooking from may be bad.
     
  5. Mackilroy macrumors 68040

    Mackilroy

    Joined:
    Jun 29, 2006
    #5
    I noticed on my computer, when I had two displays hooked to two different GPUs it wouldn't run as well as it would when I had both displays hooked up to one card. Might try that, if you can.
     
  6. jemo07 macrumors regular

    Joined:
    May 6, 2006
    Location:
    Madrid, Spain
    #6
    Well,
    I have three monitors and they all can't run on the same card and it runs very smooth for me.

    I have 2x23"ACDs on the 8800 32EFI and a Cintiq 12" on the 7300GT. All this with out a hitch.

    I am also testing the same config with the ATI 2600HD, where I have the Cintiq connected and after a fresh install of Leopard it works without a problem. I did have some earlier problems with Leopard after migrating from my MBP to the MP with Tiger and then upgrading.

    I hope this helps.
    JM
     
  7. xraydoc macrumors 604

    xraydoc

    Joined:
    Oct 9, 2005
    Location:
    192.168.1.1
    #7
    The 9200 runs on the slow PCI bus and thus has no Quartz Extreme acceleration. Try running both displays off the X800XT. It'll run much better.
     
  8. trainguy77 macrumors 68040

    Joined:
    Nov 13, 2003
    #8
    So one is a nvidia card and one is an ATI? Often when you have two different brand names you will have issues as both the drivers load and they don't play nice.
     
  9. BigMac77 thread starter macrumors newbie

    BigMac77

    Joined:
    Apr 27, 2008
    Location:
    Az
    #9
    Thanks xraydoc, I ran both off the x800xt and it runs flawlessly. I had to buy an ADC adapter to do so, but it was definitely worth it. Works great!
     
  10. xraydoc macrumors 604

    xraydoc

    Joined:
    Oct 9, 2005
    Location:
    192.168.1.1

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