GTX 780 in Mac Pro 3.1 works, but minor editing benefits

Discussion in 'Mac Pro' started by Idsz, Jul 17, 2014.

  1. Idsz, Jul 17, 2014
    Last edited: Jul 17, 2014

    Idsz macrumors newbie

    Jan 12, 2009

    I recently bought an eVGA GTX 780 3GB PC version for editing in Resolve with my good ol' Mac Pro 3.1.

    I got it to work by using the optical drive power (molex) and one 6 pin that used to power my 8800 GT. I've ordered another mini 6pin to 6pin just to be safe.

    I installed the latest OSX (10.9.4), CUDA and Web drivers, but unfortunately the increase in playback speed and render speed is only minimal.

    Final Cut X seems to benefit the most. It can playback GH4 4K footage pretty smooth. Resolve works a little bit better than before, but has problems playing back 4K footage (lots of stuttering)

    FCP7 doesn't show an increase in render speed at all.

    I tested Unigine Engine just to check (although I won't be playing games that much) and it works great. Smooth at max settings at full res.

    So I was wondering what could cause this:

    - Power: Two 6 pins in a 6 and 8 pin GPU might not be enough
    - HDD: I don't have an SSD (yet), but I do have two HDD's in Raid 0.
    - CPU: 8 core 2.8 Ghz
    - RAM: 14GB 800mhz DDR2(!)
    - CUDA: Maybe it doesn't work somehow?
    - PCIE: Placed it in the first slot (closest to the CPU), 16x PCI 2.0
    - Something I'm not aware of

  2. Korican100 macrumors 6502a


    Oct 9, 2012
    I have a GTX 780 6gb flashed for efi coming at the end of the week.

    Right now I have the GTX 680 mac edition. I was told to expect 20-40% overall faster speed.

    I will run benchmarking to see what the real increase is. Can anyone recommend a good gpu benchmarking tool?
  3. flowrider macrumors 603


    Nov 23, 2012

    Both Unigine Valley and Heaven.

  4. Korican100 macrumors 6502a


    Oct 9, 2012
    sweet thanks bro
  5. 666sheep macrumors 68040


    Dec 7, 2009
    Benchmarks ≠ real increase measurement, just synthetics. Do real world comparison (everyday tasks in software you're using the most).

    Especially post #192
  6. MacVidCards Suspended

    Nov 17, 2008
    Hollywood, CA
    Somewhere in a "should I upgrade my 4,1?" thread I noted that on "extreme hd" preset the Mac score on a 3,1 is 35 fps.

    Gtx780 to Titan Black all get 35fps.

    On my 4,1 the 780 get 40-45 and the Titan Black breaks 50.

    So there are other things holding the 3,1 back.

    BMD has always said that a 3,1 is not up to snuff for Resolve and has strongly suggested a 4,1 or newer.
  7. fuchsdh macrumors 65816


    Jun 19, 2014
    So, interesting point to throw in here:

    I just got my 7950 to replace the 5770 + Quadro combo I had. Running 10.9.4, no additional drivers, the 5770 did 728 running the Valley benchmarks at 1080p High/2xAA (Having the Quadro made no difference.) The 7950 did 1520 (36.3 fps average.)

    Running the "Extreme" benchmark as specified in the Barefeats test, I actually slightly bested the score they got--34.7 fps/1450.

    Haven't done any of the kext stuff as mentioned in other threads.

    If that's the essential performance ceiling of the 3,1's though, I'm not complaining--still getting good performance for all of $220 off eBay.
  8. 666sheep macrumors 68040


    Dec 7, 2009
    Unigine benchmarks aren't good tools for GPU performance comparison, unless your'e comparing two identical machines. CPU impact is too much to get trustworthy results. If you want a good hardware OpenGL benchmark use GPUTest from geeks3d.
  9. fuchsdh macrumors 65816


    Jun 19, 2014
    And I am testing the exact same machine, with different cards swapped in :)
  10. Idsz, Jul 21, 2014
    Last edited: Jul 21, 2014

    Idsz thread starter macrumors newbie

    Jan 12, 2009
    Thanks for the responses guys, I deleted the kexts but sadly it made no difference.

    That's really a shame, a mac upgrade wasn't really planned. I am wondering though: If i'd upgrade to 4.1 or 5.1, would it playback 4K (h.264) in Resolve smoothly (with one or two cc nodes) with the GTX 870 3GB? That's my main goal.

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