Does 2 x ATI HD 5770 make a difference in FCPX?

Discussion in 'Digital Video' started by wildgiles, Apr 19, 2012.

  1. wildgiles macrumors member

    Joined:
    Feb 6, 2011
    #1
    Just wondering if anyone has 2 x apple ATI HD 5770's in their mac pro and running FCP X if it makes any differences in exporting unrendered project timelines. Apple says FCP X is really great at using graphics cards, I'm wondering if having 2 5570's is better than 1 5870 for FCP X
     
  2. CaptainChunk macrumors 68020

    CaptainChunk

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    Apr 16, 2008
    Location:
    Phoenix, AZ
    #2
    I'm pretty sure that FCP X's OpenCL acceleration only works with one GPU. Even if it did work with two GPUs, a single 5870 would outperform a pair of 5770s. At least this is the case with Crossfired 5770s in Windows.

    If you wanted faster, you'd want a 5870.
     
  3. wildgiles thread starter macrumors member

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    Feb 6, 2011
    #3
    Dang, oh well. It's interesting that Davinci Resolve scales it's performance almost directly to the # of video cards you have.
     
  4. LethalWolfe macrumors G3

    LethalWolfe

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    Jan 11, 2002
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    Los Angeles
    #4
    Resolve was designed for people where price was not a primary consideration while FCPX was designed to run on an off-the-shelf Mac. While it would be nice if FCPX scaled up w/multiple GPUs I wonder how often that feature would be taken advantage of.


    Lethal
     
  5. cgbier macrumors 6502a

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    Jun 6, 2011
    #5
    And if you aim at DaVinci, then you should use a headless nVidia Quadro as a second GPU.
     
  6. Erendiox macrumors 6502a

    Erendiox

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    Location:
    Brooklyn NY
    #6
    Davinci doesn't really scale to the number of GPUs quite like you're describing. What it will do is use a single GPU solely for acceleration, and then a second GPU for the GUI and general computing. In this way, you can take advantage of having two GPUs running simultaneously.
     
  7. wildgiles thread starter macrumors member

    Joined:
    Feb 6, 2011
    #7
    They might sell graphics cards if FCP X advertised that it could use them. That would be a win win situation for mac pro users like me and apple. I hear that the 5870 is 20% faster than a 5770 ofr rendering in FCPX. My theory is that if FCPX could in fact use two cards would you not get 100% faster performance with renders.
     
  8. LethalWolfe macrumors G3

    LethalWolfe

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    Jan 11, 2002
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    #8
    That's how it tops out on Macs because of the limited PCIe slots. If you use a qualified PCIe extender box with a Mac or a PC tower w/more PCIe slots you can shove 4 GPUs into the mix (possibly more, not sure) and Resolve will utilize them. 4 GPUs is the recommend number by Blackmagic to really take advantage of what Resolve can do.

    You can also hook Resolve up to a render farm but I'm not sure what all goes in to doing that.


    Lethal
     
  9. Erendiox macrumors 6502a

    Erendiox

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    Oct 15, 2004
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    Brooklyn NY
    #9
    Really now, I didn't know that. Thank you for the info. I'll have to look into it. :)
     
  10. cgbier macrumors 6502a

    Joined:
    Jun 6, 2011
    #10
    You won't. The main work is still done by the CPU. The GPU has only a supporting role. If you really want to have faster render speeds, you'll need to build a render farm with a bunch of Macs and Q-Master.

    75% of all Macs sold are laptops, and as Apple wants to bring FCP X to the masses, they keep the hardware requirements pretty low (as does Autodesk with its new Smoke). A pretty nice move, I'd say.
     

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