Juan Salvo
Forum Replies Created
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Worth noting, this issue has been fixed in 9.1.4.
Colorist | Online Editor | Post Super | VFX Artist | BD Author
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Hi Paul,
[Paul King] “Win/Mac limit 4 GPU, so bigger expansion chassis makes no difference.”
Actually the GPU limit on Macs is 5. I happen to run both Mac and Linux.
[Paul King] “Titans in the release versions all come from the one factory so no variation between manufacturers for the moment.”
Sure but the question and discussion wasn’t just about Titans. And there is also the issue of motherboard manufacturers.
[Paul King] “The Supermicro board is specified by Davinci for the purpose of multiple GPUs.”
Why don’t you take a look at the config guide? They still spec an expansions chassis for anything more than 2 GPUs.
[Paul King] ” The notion that GPUs work better in an expansion chassis doesn’t make sense as rhe expansion chassis has less bandwidth than the motherboard.”
Well “better” can mean a lot of things. I meant it as in more stable and reliable. As in all the cards show up in the os between boots. As far as the issue of shared bandwidth, which has been brought up before, it’s not a factor thanks to clock sharing.
[Paul King] “If there are formulas bandied around such as 1.4 x 680 then the question is relevant comparing CUDA cores. “
No, that’s precisely the wrong comparison. Even NVidia will tell you, the number of cores alone is not a good indicator of performance. My multiplier is based on my own tests with those cards.
[Paul King] “It makes no sense to put in as many Titans as possible as they are expensive and there is obviously a limit to the number of CUDA cores required for 4k. My question was how many – 4 x 680 = 6000 cores.”
You want to talk expensive, spec out a config with K5000s. Actually Titans makes great sense for a bunch of reasons. One is the amount of RAM onboard the card which is a factor today, but will be an even bigger factor tomorrow. Again the number of cores is not what you want to be counting. But go right ahead and do as you like.
Best of luck to you.
Colorist | Online Editor | Post Super | VFX Artist | BD Author
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I’ve seen behavior vary from manufacturers to manufacturer, and between card models, and firmware updates. It works for you, thats great. But by and large, there tend to be issues with multigpus directly on the motherboard, where there are few within the expansion chassis. Better all around to just get an expansion chassis.
Colorist | Online Editor | Post Super | VFX Artist | BD Author
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One Titan does not equal one 690… much less two. Roughly speaking 1 Titan = .85 690s. Or 1.40 680s.
But that’s an incomplete evaluation.
Let me just say this. If cost is no object just use Titans. As many as you can. And always use an expansion chassis. Trying to use multiple GPUs (more than 2) on a mother board can be very frustrating.
Colorist | Online Editor | Post Super | VFX Artist | BD Author
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Internally resolve is always operating in Full 0-1023 range. So if you’re grading internally with headroom (60-940) then yeah, nothing will behave appropriately.
Colorist | Online Editor | Post Super | VFX Artist | BD Author
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Counting cores is not a good way of measuring performance between GPUs. It’s very much an apple to oranges comparison.
Colorist | Online Editor | Post Super | VFX Artist | BD Author
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Depends. If I can deliver to a supported codec it’s not an issue. Sometimes, just work on Mac. Sometimes, just render on Mac. Sometimes render dpx and convert.
Colorist | Online Editor | Post Super | VFX Artist | BD Author
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[Rick Turners] “Can Linux work with prores? Can it render prores?
How does one work around needing to render and ideally work in prores?”No. No. And by having a Mac. 🙁
Colorist | Online Editor | Post Super | VFX Artist | BD Author
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Yes. It’s perfect when you’re working in P3.
Colorist | Online Editor | Post Super | VFX Artist | BD Author
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I’m willing to bet this wasn’t shot on film.
Colorist | Online Editor | Post Super | VFX Artist | BD Author