Are All My Video Cards Dead? 7950

Discussion in 'Mac Pro' started by sammyman, Apr 14, 2015.

  1. sammyman macrumors 6502a

    Mar 21, 2005
    I just picked up 3 video cards from eBay. They were advertised as good used cards. I bought 7950's Saphire Edition.

    The first one has a fan that spins really loud and then loses picture in about 30 seconds.

    The second one loses picture in about 15 seconds.

    The third one seems to work for about 5-10 minutes and then shuts off.

    Is it possible because these are PC video cards that I am having issues. I realize there won't be any boot screen, but I'm wondering if all of the video cards are busted, or if they just don't play well in my 2009 Mac Pro on Yosemite for some reason. A 5770 and a GT120 both work perfectly in the Mac.
  2. h9826790 macrumors G4


    Apr 3, 2014
    Hong Kong
    How you power the card? All 3 cards installed in the same machine?
  3. NOTNlCE macrumors 6502a


    Oct 11, 2013
    DMV Area
    On that third one, it might be overheating. I would reapply the thermal grease for a quick test, if you're comfortable doing that. I once bought a Radeon 4850 a while back and it would act similarly (work for about 5-10 minutes and then shut off) until I redid the thermal compound. (It was overheating.)
  4. Macinsquatch macrumors member

    Mar 28, 2015
    I too vote to reapply the thermal paste. Sounds like you may have bought cards that were used as miners, amazing how quickly that can destroy a graphics card.
  5. sammyman thread starter macrumors 6502a

    Mar 21, 2005
    I'm wondering if I should file a complaint with Paypal.

    I am wondering also if Chrome could have caused these problems? I do use chrome occasionally. I'm testing these now in a second machine to see if there are any problems.

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