help with adding dual video cards for mac pro 5 1

Discussion in 'Mac Pro' started by blueeggs, Dec 30, 2015.

  1. blueeggs macrumors member

    blueeggs

    Joined:
    Apr 15, 2010
    #1
    Hey guys, I have a mac pro 5 1 with a 5770 and I want to add a gtx 980 reference card I just bought for it. I wanted to add an original mac pro low powered card of flashed one that doesn't require aux power to it, gets all its power from the pci e bus so I can have a good screen. I would rather do this instead of getting my 980 flashed.

    Thanks in advance!
     
  2. h9826790 macrumors 604

    h9826790

    Joined:
    Apr 3, 2014
    Location:
    Hong Kong
  3. blueeggs thread starter macrumors member

    blueeggs

    Joined:
    Apr 15, 2010
    #3
    My question was what low power mac pci e card and I add to where I don't have to plug in any 6 or 8 pin adapters. I did some research and it looks like the gt120 will run on the pci e bus power alone. Also are there any performance differences between an flashed and non flashed gtx 980 in a mac pro? Thanks for your input. Sorry I thought I explained it well enough.
     
  4. h9826790 macrumors 604

    h9826790

    Joined:
    Apr 3, 2014
    Location:
    Hong Kong
    #4
    You just told us what you are planing to do, and you didn't ask anything, that's why I want to confirm your question.

    Anyway, yes, GT120 is the correct card to do it.

    AFAIK, there is no real performance difference between flashed and non-flashed card in OSX. However, if you may use it in Windows, then there is some performance penalty for the non-flashed card. Also, It seems install a GT120 and 980 together in Windows 10 will have driver issue.
     
  5. ActionableMango macrumors 604

    ActionableMango

    Joined:
    Sep 21, 2010
    #5
    Apple GT120 used to be the go-to card for this, but as h9826790 stated, current Nvidia Windows drivers don't support both GT120 and 980 together.

    Also, official Apple video cards are expensive. If I already had one as a spare, I could see not flashing the 980. But if you have to spend the money to get an Apple GT120, why not just use the money to flash the 980 instead? Then you don't have to deal with having two cards, using up two slots, managing multiple cables to multiple inputs on monitors. You'll have proper boot screens on your 980 and full speed PCIe bandwidth in Windows.
     
  6. Bytehoven macrumors regular

    Bytehoven

    Joined:
    Dec 1, 2015
    Location:
    Up Shellpot Creek
    #6
    How about the single slot GT 640 with a Mac Flash. MacVidCards sells one for around $100 and I have seen them in that range on EBAY. I have thought about getting GT 640 Mac for my cMP with the GTX 980 Ti.
     

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