Mac Pro 3,1 - Kernal Panics after 760 GTX install

Discussion in 'Mac Pro' started by TKEik683, Feb 3, 2014.

  1. TKEik683 macrumors member

    Jul 9, 2007

    I recently went to replace the ATI 6870 in my 2008 Mac Pro.

    I purchased an MSI 760 GTX 2gb OC. I thought the TDP on it was 170w so the two 6 pin and the Mac Pro would be fine to power it.

    Now, whenever I put any load on it (a game of sc2, mine some doge), it will kernal panic.

    I am on 10.9.1

    I have not installed any drivers from online. I wasnt sure which nvidia ones to install, if any at all.

    I have reset the PRAM.

    Any help would be greatly appreciated!


    Here is part of the kernal panic:

    Mon Feb 3 20:44:17 2014
    panic(cpu 2 caller 0xffffff7f8c89cd0d): NVRM[0/2:0:0]: Read Error 0x00000100: CFG 0xffffffff 0xffffffff 0xffffffff, BAR0 0x8a000000 0xffffff8133f7c000 0x0e4070a2, D0, P3/4
    Backtrace (CPU 2), Frame : Return Address
    0xffffff8124efb710 : 0xffffff800a622f69
    0xffffff8124efb790 : 0xffffff7f8c89cd0d
    0xffffff8124efb850 : 0xffffff7f8c969e26
    0xffffff8124efb890 : 0xffffff7f8c969e84
    0xffffff8124efb900 : 0xffffff7f8cb89f31
    0xffffff8124efb970 : 0xffffff7f8c98d011
    0xffffff8124efb990 : 0xffffff7f8c8a3841
    0xffffff8124efba40 : 0xffffff7f8c8a1362
    0xffffff8124efbc40 : 0xffffff7f8c8a3468
    0xffffff8124efbd30 : 0xffffff7f8ccb45c0
    0xffffff8124efbd90 : 0xffffff7f8ccb2464
    0xffffff8124efbe10 : 0xffffff7f8cc96ab7
    0xffffff8124efbe40 : 0xffffff7f8cc6e493
    0xffffff8124efbe60 : 0xffffff7f8c125768
    0xffffff8124efbe80 : 0xffffff7f8c126517
    0xffffff8124efbec0 : 0xffffff7f8c123d81
    0xffffff8124efbef0 : 0xffffff800aaada80
    0xffffff8124efbf30 : 0xffffff800aaac522
    0xffffff8124efbf80 : 0xffffff800aaac5f7
    0xffffff8124efbfb0 : 0xffffff800a6d6aa7
    Kernel Extensions in backtrace:[3A2A3C2D-E129-3190-A682-E831B38F0FBF]@0xffffff7f8c84c000->0xffffff7f8cab5fff
  2. chomomo macrumors member

    Oct 5, 2009
    Los Angeles, CA
    Remove old kext files and install new drivers.

    1. Remove all the existing driver/kext files for ATI if you are no longer using the ATI card.

    2. You need to install the drivers for your card. At least the CUDA drivers since the card is over 2GB.

    As well as update your Mac to the latest drivers via the Mac s/w update just to cover your bases.
  3. MacVidCards Suspended

    Nov 17, 2008
    Hollywood, CA
    I'm sorry, this is truly bad advice.

    The 2GB limit had to do with OpenCl. It was an artificial limit imposed by Apple and discovered by Netkas and myself. It no longer applies to anything.

    Deleting ATI/AMD drivers is great advice....for Windows. Not EVER done in OSX.

    CUDA drivers only affect....CUDA. No effect on anything else. Since games don't use CUDA, no part of issue here.

    In 2008 Mac Pro first thing to check is if fan is spinning.

    Leave side off case and run machine. If fan doesn't spin faster during GPU intensive apps, move to slot 2.
  4. m4v3r1ck macrumors 68020


    Nov 2, 2011
    The Netherlands
    Hi, I have an EVGA GTX+670 FTW 4GB in slot #1 and indeed when playing CoD4 I don't hear any increase of fan-noise while side is open. In BC Win8Prox64 the GTX immediately starts spinning.

    What is the difference between the two slots and why does slot#2 works better for a GTX PC-version?

    #1 EVGA GTX-670-FTW-4GB for PC
    #2 Apricorn Velocity X2
    #3 Nvidia 8800GT for Mac
    #4 spare

    Thanks and cheers!
  5. TKEik683 thread starter macrumors member

    Jul 9, 2007
    Thank you MacVideoCards.

    I moved the card to PCI #2 and it seems to be running better now. I can hear it spin up under load.

    I am still having it not perform as well as I would like, but that might be the program itself (sc2).

    I will also need to re figure out mining as I am getting less than with my 6870.

    I will keep an eye on the panics and see if they are gone.

  6. Asgorath macrumors 68000

    Mar 30, 2012
    For what it's worth, this:

    seems to indicate the driver failed to read some piece of GPU memory (probably a register). Those 0xffffffff values for CFG, which I'm assuming is PCIe config space, mean the driver can no longer talk to the GPU, which is a pretty fatal error. This makes sense given that your fan wasn't spinning up, the GPU probably overheated to the point where it completely locked up or turned itself off or something.
  7. TKEik683, Feb 4, 2014
    Last edited: Feb 4, 2014

    TKEik683 thread starter macrumors member

    Jul 9, 2007
    Thank you again for the response.

    One more quick question. I am not seeing the mining rates I would expect. Can this be related to the no CUDA drivers? Does mining (Asteroid App) use CUDA?

    EDIT #1: Just remembered its CUDA miner.... Will see how it works after installing CUDA driver.

    EDIT #2: No change in KH's after installing CUDA. I am still seeing about half of what I was seeing with the 6870...
  8. TKEik683 thread starter macrumors member

    Jul 9, 2007
    Nope, still having issues. Getting a lot of crashes in both windows and OSX.

    Mostly while trying to play a games.

    Not sure what to try next.

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