GPU via PCIe x16 riser cable

Discussion in 'Mac Pro' started by max001, Feb 14, 2017.

  1. max001 macrumors newbie

    Joined:
    Feb 13, 2017
    #1
    Say for instance I decide to put a triple slot height graphics card in my 2009 Mac Pro, the second 16x slot would be blocked. Could I use a 3m PCI-E extension cable to make use of the second 16x slot? I appreciate any PCI-E device wouldn't have a 'secure slot' but it could be secured in the case by other means.

    Basically right now i have GTX 770 4gb in my mac and 5770. GTX is powered by external 500w power supply my idea is to get 3m PCIe x16 riser cable and connect another 770 that would be attache outside via another power supply. I see people doing this in PC and it works i wonder i it will work with mac

    Here is the cable i will use
    https://www.digikey.com/product-detail/en/3m/8KC3-0726-0500/3M12026-ND/3641403

    Thanks
     
  2. h9826790 macrumors 604

    h9826790

    Joined:
    Apr 3, 2014
    Location:
    Hong Kong
    #2
    It's possible, at least one guy here reported successfully doing that. However, also at least another member reported that even he get the low profile cable, still can't fit that into the slot (blocked by the GPU heatsink). So, I think it really depends on your graphic card and cable.
     
  3. William_si macrumors regular

    William_si

    Joined:
    Apr 4, 2016
    Location:
    Croatia
    #3
    Depends on cable, i did this on slot 3 at some time with x4 for a pcie ssd and a GPU each in 1 and 2.

    A 270X was fine in height, some Asus 280X was not.

    The 3m cables are much better and for x16 absolutely better than the ebay stuff i had for x4.

    Pics:
    http://m.imgur.com/a/81NVk
     
  4. AidenShaw macrumors P6

    AidenShaw

    Joined:
    Feb 8, 2003
    Location:
    The Peninsula
    #4
    "Double width" GPUs are pretty common, but I've never heard of a "triple height" card.
     
  5. William_si macrumors regular

    William_si

    Joined:
    Apr 4, 2016
    Location:
    Croatia
    #5
    There are a bunch, some by higher cooler covering half a slot and some as design due to TDP (eg. 390X2 variants).
     
  6. thornslack macrumors regular

    Joined:
    Nov 16, 2013
    #6
    Some Asian market cards and a few of Asus' have exceeded even three slots.
     
  7. AidenShaw macrumors P6

    AidenShaw

    Joined:
    Feb 8, 2003
    Location:
    The Peninsula
    #7
    But that's "triple width", not "triple height".
     
  8. thornslack macrumors regular

    Joined:
    Nov 16, 2013
  9. h9826790 macrumors 604

    h9826790

    Joined:
    Apr 3, 2014
    Location:
    Hong Kong
    #9
    This is from Nvidia website

    Screen Shot 2017-02-15 at 14.15.37.jpg

    So, obviously, the card in this way.
    Screen Shot 2017-02-15 at 14.14.38.jpg
     
  10. thornslack macrumors regular

    Joined:
    Nov 16, 2013
  11. esatamacmodular macrumors member

    Joined:
    Nov 27, 2014
    #11
    I thought it was better to get risers with a capacitor and molex power on it... or is that only for eGPU? In any case, where is a good place to get pci-e 2.0 16x riser cables? or is 3m the only way to go?

    ...I'm looking to make a thinner desktop case and the GPU is sticking out. I thought a riser cable would help me move the card to a more suitable position.
     

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