GTX 750 TI on Mac Pro 1.1 only working with 4 Lane PCIe-Slot

Discussion in 'Mac Pro' started by alclonky, Dec 18, 2014.

  1. alclonky macrumors newbie

    Joined:
    Dec 18, 2014
    #1
    Hi,
    i got a GTX 750 TI (Palit one) for my 1.1 Macpro (2.1 with Firmware Update),
    but the GPU is not recognised if i put it into a 16x or 8x PCI-e Slot.
    It only work if i switch the Port to 4x or 1x.
    I am on OS X 10.10.1 with nvidia web drivers

    is it possible to do something about it?
     
  2. sarthak macrumors 6502

    Joined:
    Nov 19, 2012
    Location:
    Canada
    #2
    Check if you have other cards installed in the PCIe slots. If so you should get a utility upon boot to specify PCIe lane configuration. However, since you are running it on a 1,1 it is likely it's not included in Yosemite (AFAIK not required for 2008 machines).
     
  3. NOTNlCE macrumors 6502a

    NOTNlCE

    Joined:
    Oct 11, 2013
    Location:
    DMV Area
    #3
    Ironically enough, there's a new updated version of the PCIe Lane Utility included in Yosemite. I agree though, check your configuration. Though you might not have any luck - PC cards are temperamental. I have to use my GeForce 405 in Slot 2. If I put it in Slot 1, it won't wake from sleep. Just a compromise that has to be made to keep the older towers alive.
     
  4. alclonky thread starter macrumors newbie

    Joined:
    Dec 18, 2014
    #4
    I checked it with the utility

    Slot 1 - doestn't work (Slot1 can only be 8x or 16x)
    Slot 2 - works with x1 Setting but not with x8 Setting
    Slot 3 - works with x1 and x4 Setting
    Slot 4 - Card doesn't fit

    In Windows the Card works in Slot1 so it can't be a technical issue but a driver one?
     
  5. NOTNlCE macrumors 6502a

    NOTNlCE

    Joined:
    Oct 11, 2013
    Location:
    DMV Area
    #5
    Could be. Unfortunately, troubleshooting is a bit of a trial and error process with these kind of things. I would test as much as you can and just stick with the configuration that works BEST, whether or not it's the most optimal is up in the air.
     
  6. aaronlroberts macrumors newbie

    aaronlroberts

    Joined:
    Apr 19, 2017

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