MacVidCards GeForce 780GTX - FurMark blinks off 2009 Mac Pro

Discussion in 'Mac Pro' started by gsloan, Oct 29, 2013.

  1. gsloan, Oct 29, 2013
    Last edited: Oct 31, 2013

    gsloan macrumors member

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    Jul 6, 2013
    #1
    Just tried running FurMark tonight on my 2009->2010 Mac Pro with an eVGA GeForce GTX 780 modified by MacVidCards, which to my knowledge was a stock-clocked board.

    Within a second of running FurMark, the system blinked off. I've had no problems running any games, Luxmark, or Heaven, but FurMark caused an instant shutdown. I've had no other power-related issues with this system.

    Looks like I'm going to need an FSP Booster PSU. Evidently, not all 2009+ Mac Pros will be able to run a 780 without running into power issues.

    Since MVC has questioned the veracity of my concern, I'd request that anyone who's purchased a 780 from MVC who's got Windows run FurMark's 60 second benchmark and please post your results here. I'd like to see how many others experience the same issue. 10/31 Update - FurMark does NOT power off in OS X, but does under Windows, for me - Curious to see if anyone else has this happen under Windows specifically

    Note - I've got no problems playing games, running AE, Unigine Heaven, etc., but FurMark shouldn't blink the system off in a second or two.
     
  2. Demigod Mac macrumors 6502a

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    Apr 25, 2008
    #2
    Probably not necessary given that Furmark is some of the most insane, sustained stress that you can put on a graphics card. Highly unlikely to encounter that in real-world conditions.
     
  3. gsloan thread starter macrumors member

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    Jul 6, 2013
    #3
    Understood - If the system sustained it for 60 seconds, I might be fine with it. But as soon as I saw the test graphics, the system hard shut down. I'm not talking a blink-off after 4 hours of stress...I'd at least like to see it get through 60 seconds.
     
  4. netkas macrumors 65816

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    Oct 2, 2007
    #4
    Furmark puts the device into a condition where it uses a way more power that it's TDP. Obviously 2x6-pin cant provide that.
     
  5. gsloan thread starter macrumors member

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    Jul 6, 2013
    #5
    It was advertised as being able to run off of internal power. Supposedly, the difference between it and the Titan is that the Titan would blink off on one of MVC's rigs if powered internally and the 780 would not, which is why I assume an external/FSP Booster PSU is recommended for the Titan. By the same token, it may be a good idea for the 780 as well. Just reporting my experience.

    My 680GTX ran fur mark without issue.
     
  6. rabidz7 macrumors 65816

    rabidz7

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    Jun 24, 2012
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    Ohio
    #6
    Using 6-8 pin adapters WILL DESTROY your Mac Pro. NEVER use one. EVEN IF the card has been downclocked to use 225W, it can still draw 150W from the 8 pin cable and the other 75W from the 6pin cable and the slot. Is the risk worth 30$?!
     
  7. gsloan thread starter macrumors member

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    Jul 6, 2013
    #7
    I'm not using a 6-to-8 cable. MVC modded the card by soldering the additional 2 power connectors to one of the 6. And it's not running down clocked. It came this way from MVC.

    What is this $30 solution you mention?
     
  8. sunnyj, Oct 30, 2013
    Last edited: Oct 30, 2013

    sunnyj macrumors 6502

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    #8
    Did you plug in the 6 pin cable on the right side or left side of the 8 pin connector on the gtx 780?
     
  9. gsloan thread starter macrumors member

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    Jul 6, 2013
    #9
    Not sure I get the question. The 6-pin only fits into one part of the 8-pin connector. The plastic surrounding each pin is shaped to block improper power cable insertion. Regardless, if it wasn't plugged in correctly and only one 6-pin connector was present, there would be no video.
     
  10. TheDoc macrumors member

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    Mar 18, 2008
    #10
    I think he's referring to buying an external PSU to help power the card.
     
  11. 666sheep macrumors 68040

    666sheep

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    #11
    Running Furmark isn't worth $30 and losing optical bay ;)
     
  12. ActionableMango macrumors G3

    ActionableMango

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    Sep 21, 2010
    #12
    Furmark uses so much power it has literally destroyed cards. It uses far more power than even the most demanding applications. It's not really a good measure of your power needs.
     
  13. pootahauntus macrumors newbie

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    Oct 23, 2013
    #13
    It has already been confirmed by MacVidCards and flowrider that pcie booster (6pin) plugged into the 8 pin slot of modded cards (whilst still able to power up) will draw >75W from that slot.

    Did some calculations and derived at this:

    MacVidCards - GTX285 (running Furmark) total power draw: 223.1W
    - PCIE Slot: 60.1W (80% of 75W)
    - Booster cable (6pin): 53.0W (70% of 75W)
    - Booster cable (8pin): 110.0W (73% of 150W) <- card originally 8+6pin powered

    flowrider - GTX780 (running Furmark) total power draw: 230.5W
    - PCIE Slot: 56.3W (75% of 75W)
    - Booster cable (6pin): 64.6W (85% of 75W)
    - Booster cable (8pin): 110.6W (74% of 150W) <- despite using 6 pin booster cable

    Seems like power draw is relatively equal (70-85%) over the different slots, which makes sense. So it doesn't matter if your 8pin slot has been soldered to work with a 6 pin cable, the slot will draw power as it wish.
     
  14. gsloan thread starter macrumors member

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    Jul 6, 2013
    #14
    I realize that FurMark has destroyed some cards in the past and I'm not advocating using it as a long-term burn-in tool.

    Again, I'm not letting it sit for 4 hours straight - I simply tried to get it through a 60 second "benchmark" and within 2 seconds, the system powered itself off.

    I was informed that this card would make it through FurMark while the Titan would not, though it was suggested that FurMark not be run for hours and hours. All I'm saying is that in my particular setup, I didn't make it 2 seconds.

    In a nutshell, if Titan needs an external PSU because it fails at FurMark but games fine for hours and hours, by the same logic, the 780GTX needs an external PSU in some systems.

    Where can I find one of these external PSUs for $30? I'm seeing 'em at $70+. And I've already got an external optical drive that works fine. ;)
     
  15. ActionableMango macrumors G3

    ActionableMango

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    #15
    Ok. It just seems like a lot of effort to get Furmark working, but it's your time and money. :)
     
  16. pastrychef macrumors 601

    pastrychef

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    Location:
    New York City, NY
    #16
    Knowing that a piece of software could take down my system like that would make me uneasy. Plus, if/when something ever went wrong with the computer, I'd always look to the video card as being the culprit first. An auxiliary power supply would buy me peace of mind.

    Just my two cents...
     
  17. Inconsequential, Oct 30, 2013
    Last edited: Oct 30, 2013

    Inconsequential macrumors 68000

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    #17
    I'm sorry what?

    Your still attempting to draw more than 75W from the 2nd 6-pin, irregardless of how you split that 6 pin power!!!

    Tut tut MVC.

    :rolleyes:

    For reference, my 7950 draws according to iStat

    50/40/90W.

    I assume the 90W is from the slot, with the 50/40 from the Boost wires.
     
  18. 666sheep macrumors 68040

    666sheep

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    Poland
    #18
    It would be weird, because slot can deliver 75W maximum.
     
  19. pastrychef macrumors 601

    pastrychef

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    Sep 15, 2006
    Location:
    New York City, NY
    #19
    This one is under $30.

    * Disclosure: I have never used one and have no idea how well it performs.
     
  20. gsloan, Oct 30, 2013
    Last edited: Oct 30, 2013

    gsloan thread starter macrumors member

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    Jul 6, 2013
    #20
    Any others you know of? One of the comments says the PSU is loud...I'd rather add one that doesn't add much noise.

    And...does anyone have experience mounting one of these? Are there holes you have to punch somewhere to run the cables to the video card?
     
  21. DanielCoffey macrumors 65816

    DanielCoffey

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    Nov 15, 2010
    Location:
    Edinburgh, UK
    #21
    It might actually be a good idea to report this to MVC since he sold you the card. It would be polite to give him an opportunity to comment in private before airing it here.
     
  22. gsloan thread starter macrumors member

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    Jul 6, 2013
    #22
    It might be, but then again, it might not. I appreciate the etiquette lesson. Much obliged.

    That being said, I'd like some feedback from the community to see if anyone else has experienced similar issues when running a benchmark that this card was supposed to complete.

    Considering that MVC replies to my emails selectively, whenever it's convenient, or never, I feel it's prudent to start a discussion here and have him chime in if and when he decides to.
     
  23. pastrychef macrumors 601

    pastrychef

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    Sep 15, 2006
    Location:
    New York City, NY
    #23
    This but it's much more expensive... Again, I have zero experience with any of these auxiliary power supplies...
     
  24. MassMacMan macrumors regular

    Joined:
    Jul 12, 2012
    Location:
    Boston MetroWest
    #24
    I can report good results with an MVC GPU and FurMark. I recently installed an MVC-flashed GTX 580 without any external PSU. I also run an old GT 120 in the same machine to a third monitor. Although FurMark makes the fans in the GTX 580 spin up something crazy, the card obligingly performs the benchmark and reports good results. At 1600x900, AA off, I'm getting a score of 4510 at 75 FPS.
     
  25. sunsetsothickly macrumors member

    Joined:
    May 21, 2005
    #25
    There are a few reviews (none too favourable) about the JuiceBox floating about. Sounds like the Booster is worth the premium.
     

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