GTX680 and GTX1070 in same tower?

Discussion in 'Mac Pro' started by ix9, Nov 24, 2016.

  1. ix9 macrumors newbie

    Nov 24, 2016
    So I picked up a GTX1070 recently, and have been using it under Windows Bootcamp - very happy with the card.

    Expecting Pascal drivers to arrive "soon"
    In the meantime I'd like to be able to use OSX.

    Currently, I'm rip and replacing the GTX1070 with a GT120 (as they will not co-exist in Windows) every time I want to use OSX.

    I also have a GTX680 (EVGA 2GB, flashed) lying around.

    Could I run the GTX680 (without PCI-E power cables) alongside the GTX1070?
    I know the GTX1070 won't POST without the PCI-E power cables connected. Not sure about the EVGA GTX680....

    Alternatively - any nice way to have the GTX1070 and GT120 work at the same time (under Windows)?
  2. chriz_r macrumors member


    Nov 10, 2016
    You'll need to have all pcie connectors connected on all cards for the computer to properly post, so that needs to be addressed first.
  3. SoyCapitanSoyCapitan macrumors 601


    Jul 4, 2015
    Highly doubt this support will come. Maxwell support never left the beta stage and still isn't official despite the driver builds going from 346 all the way up to 367.
  4. ix9 thread starter macrumors newbie

    Nov 24, 2016
    For those playing at home....
    Some PCIE power splitter arrived the other day.

    The GTX680 and GTX1070 happily coexist in the Mac Pro under Windows 10.

    Just check fan clearances - I had the 680 in slot 2 above the 1070 in slot 1, the card sagged a little against the 1070's fan and stopped it from spinning freely.
  5. ActionableMango macrumors G3


    Sep 21, 2010
    Yikes. Both with a workload at the same time? Or just using one at a time?
  6. hamishb macrumors member

    Jun 14, 2002
    Vic, Australia
    What power cables did you need and where did you get them from? Looking at a similar setup for my son (who currently runs windows 10 in a 4,1 with a GTX 970)
  7. ix9 thread starter macrumors newbie

    Nov 24, 2016
    Just one with a workload at once, of course ;)

    Just standard 6-pin PCI-E power splitters for a few dollars off ebay.
  8. jacobbriggs29 macrumors newbie

    Dec 28, 2016
    I currently am running a GTX 680 on a Mac Pro 5.1, I'm thinking about bootcamping to Windows 8 on my 2TB HDD.

    How have you guys found bootcamping? I mean as in did you run into a lot of problems?

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