ATI 5770 And 2 gtx 680 4gb

Discussion in 'Mac Pro' started by enny001, Apr 1, 2015.

  1. enny001 macrumors member

    Joined:
    Apr 30, 2013
    #1
    Hi guy right now i have mac pro 2009 runing davinchi resolve with ati 5770 and gtx 550ti in my mac with 2 external power 8 pin i believe cables. i can get 2 gtx680 4gb for 300. Since i don't use my optical bay dvd player can i use that power to run 2gtx 680 and ati 5770 without external power and i will have to modify my mac to fit 3th card.

    Did anybody do this type of thing?

    Thanks
     
  2. Surrat macrumors 6502

    Surrat

    Joined:
    Jun 20, 2014
    Location:
    United States
    #2
    No, the dvd power sockets do not supply enough power. They are I believe 46 or 56 watts max each, where the 680 requires two 75 watt 6pin, or perhaps one 75 watt 6pin + 150 watt 8pin cable.

    Your will need to use your external power supply to feed them, and leave the internal mac cable for the 5770.
     
  3. ActionableMango macrumors 604

    ActionableMango

    Joined:
    Sep 21, 2010
    #3
    I don't know anyone running two GTX680 4GB cards on the MP power supply.

    However, there are people running two GTX970 4GB cards on the MP power supply using nothing more than y-cables to split the existing GPU power leads from the motherboard. Apparently the GTX970 is power efficient enough that this works.

    The price difference between the 680/4GB and the 970/4GB is not that much, so you might consider doing that if you want two cards.
     

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