Mac Pro 5.1 - 780 GTX Question

Discussion in 'Mac Pro' started by tuncer, Nov 1, 2013.

  1. tuncer macrumors member

    Joined:
    Mar 19, 2008
    #1
    Hi all,

    What's the general consensus on internal vs external power supply for a 780 GTX in a Mac Por 5.1 (Mid-2010). Got the card and noticed that the video card needed an 8 pin connection. So for now I plugged in the two 6 pin connectors and it all seems to work fine (for now). Any advice would be greatly appreciated :)

    I'm going from a 680 GTX to 780 GTX.
     
  2. DanielCoffey macrumors 65816

    DanielCoffey

    Joined:
    Nov 15, 2010
    Location:
    Edinburgh, UK
    #2
    The 780 should detect that you have only put a 6-pin in the 8-pin socket and limit its power draw. If you had put a 6-to-8 converter in there, it would attempt to draw its full power if needed for the task at hand.

    If you avoid running benchmarks or stressing the card to 100% you should be OK even for long-term use because the card will not need much more power than the MP can provide.
     
  3. pastrychef macrumors 601

    pastrychef

    Joined:
    Sep 15, 2006
    Location:
    New York City, NY
    #3
    Even if you only use two 6 pin cables, the 8 pin connector can still try to pull more than 75W.
     
  4. tuncer thread starter macrumors member

    Joined:
    Mar 19, 2008
    #4
    So far been running it without any issues. Battlefield 4. I'll see how it goes though a tad nervous ;)
     
  5. flowrider macrumors 601

    flowrider

    Joined:
    Nov 23, 2012
    #5
    My MVC modified Gigabyte GTX780 has been running great for over a month now. I have no issues, nor do I expect to have any. Awesome fast card.

    Lou
     
  6. Celedral macrumors 6502

    Celedral

    Joined:
    May 29, 2008
    Location:
    Los Angeles
    #6
    Looking to pick up a 780 as well, especially with the recent price drop.
     
  7. tuncer thread starter macrumors member

    Joined:
    Mar 19, 2008
    #7
    Just a follow up. I started experiencing crashes and weird artifacts with Battlefield 4 and I suspected it was the power supply. I bought an external power supply to hook up the 8 pin wire and everything is working peachy now.
     
  8. MacVidCards Suspended

    Joined:
    Nov 17, 2008
    Location:
    Hollywood, CA
    #8
    Hi, are you using one of our EFI'd cards or a PC one?
     
  9. tuncer thread starter macrumors member

    Joined:
    Mar 19, 2008
  10. jetjaguar macrumors 68030

    jetjaguar

    Joined:
    Apr 6, 2009
    Location:
    somewhere
    #10
    I have a macvidcards one and I use two 6 pins with no issues
     
  11. nurali macrumors newbie

    Joined:
    May 3, 2008
    #11
    Tuncer,
    which external power supply did you buy mate? :)
     

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