GTX 970 Bootcamp crash in 5,1

Discussion in 'Mac Pro' started by blackcrayon, Feb 19, 2015.

  1. blackcrayon macrumors 68000

    Joined:
    Mar 10, 2003
    #1
    Picked up a Gigabyte GTX 970G1 yesterday.

    After figuring out I needed the latest web drivers, (and needed to shut off the 970 in order to be able to boot far enough to install them with my old GT120), I got that working. Boots into OS X fine.

    However in Bootcamp (win 8.1), the card only works for 10-20 minutes in 3D games (Elite Dangerous, Star Citizen). Then the video shuts off and the Mac reboots. I tested with Furmark and it lasts about 2 minutes on the stress test until a crash and reboot. In this case I needed to shut down the Mac completely then start it up again for the card to continue working.

    I don't use the internal mac PSU for the power ports on the card - I use an external PSU. At first I was running with a 600 watt Corsair for the card. Then switched to a 700 watt Thermaltake I had lying around (I know not the best PSUs but just powering the ports on the card is way under their limit). Also, I had been running a Radeon 7970 with the Corsair that way in the Mac for well over a year with no stability issues. Updated to the latest firmware on the card, didn't help. I also watched the temperature and fan speed while the benchmarks were running, the card never got to any unusually extreme state, maybe maxing at 68 C in Furmark.

    I was just about to consider returning the card as possibly faulty when I stuck it in a PC case. Doesn't seem to crash after even 15 minutes or so in Furmark.

    Anyone have any suggestions on why the new card can't seem to handle 3D gaming load in the Mac?
     
  2. netkas macrumors 65816

    Joined:
    Oct 2, 2007
    #2
    I had mp3,1 with gtx980 shutdown while I played ac:unity, after some time.

    Improving cold air flow (opening window) had fixed the issue, I guess it was overheat of videocard or smth else in computer.
     
  3. blackcrayon thread starter macrumors 68000

    Joined:
    Mar 10, 2003
    #3
    Wasn't expecting a quick reply from the famous netkas ;)

    I don't *think* it's the card overheating based watching the temps and the fact it runs at about the same temp in my PC, but i hadn't considered something else inside overheating. I'll add some "unrealistic" cooling and see if that makes a difference.

    Thanks
     

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