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

    Joined:
    Jan 12, 2009
    #1
    Hi,

    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

    Cheers,
     
  2. Korican100 macrumors 6502a

    Korican100

    Joined:
    Oct 9, 2012
    #2
    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 601

    flowrider

    Joined:
    Nov 23, 2012
    #4


    Both Unigine Valley and Heaven.

    Lou
     
  4. Korican100 macrumors 6502a

    Korican100

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

    666sheep

    Joined:
    Dec 7, 2009
    Location:
    Poland
    #6
    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

    Joined:
    Nov 17, 2008
    Location:
    Hollywood, CA
    #7
    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 6502a

    Joined:
    Jun 19, 2014
    #8
    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

    666sheep

    Joined:
    Dec 7, 2009
    Location:
    Poland
    #9
    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 6502a

    Joined:
    Jun 19, 2014
    #10
    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

    Joined:
    Jan 12, 2009
    #11
    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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