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GPU mixing and the Cubix

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Charles Haine
GPU mixing and the Cubix
on May 28, 2012 at 7:46:31 pm

So, this might be a little obscure, but here it goes:

We just set up a second room, but only have 1 Cubix, which is full of 285s with a RED rocket and lives in our bigger, more theater style room.

However, I was thinking of putting in a Cubix expander card in the other machine, so that I could easily move the Cubix around (if there is an editorial job in the theater, say, and we wanted the rocket in the smaller broadcast room).

However, in that smaller room we just have an internal 570 for GPU, with a GT120 running the monitors.

Now, if I plugged in the Cubix to the little machine, I'd have 3 285x and 1 570 GPU. How would Da Vinci handle that? They need to all be identical to function, is that, correct?

Should I swap out my 285's for 570s in the Cubix?

Could I get away with 580's in the Cubix with the 570 internal and Da Vinci will use all of them?

Any help would be greatly appreciated.

Charles Haine

http://www.dirtyrobber.com


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Robbie Carman
Re: GPU mixing and the Cubix
on May 28, 2012 at 8:25:59 pm

Hey Charles -

The deal with mixing in the cubix in my experience is that because your sharing one PCIe slot the net result is the cards what ever the mix run at the speed and performance of the slowest card.

[Charles Haine] "Could I get away with 580's in the Cubix with the 570 internal and Da Vinci will use all of them?"

You'll have the same problem essentially - the GPU processing chain will in my experience be based of the slower card -doesn't matter where they reside. However, slightly modified from what your saying is pull the GT 120 which is essentially what I've done in our systems. We have 3X 580s in the cubix boxes +RR and I run GTX 285 cause we had a few of them as GUI. In a Mac I don't see a better option at the moment. I can toss pretty much anything at it. Still chokes a bit at 5k but 99 precent of my work is 1080 with a good mix of 1080 S3D jobs. System has been rock solid.

The other issue to consider an I'm assuming your on a mac pro - is that if you put that cubix card in the proper 16x slot you loose that for the 570 you haves that card will run even slooooooower with the cubix. I think what I'd do is pull the 570 in the second box when attaching the cubix (and thus the 16x cubix card) and put it back when your done with cubix.

Robbie Carman
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Dan Moran
Re: GPU mixing and the Cubix
on May 29, 2012 at 8:45:53 am

Robbie is exactly right! Resolve can only run as fast as the slowest card in the chain.

I hope this helps!

Thanks,

D

Dan Moran
DaVinci Application Specialist
Blackmagic Design EMEA


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Christopher Tay
Re: GPU mixing and the Cubix
on May 29, 2012 at 12:56:10 pm

Resolve Mac can only run up to 3 GPUs so in this scenario, which GPU will Resolve reject ?

Actually it wouldn't matter if Resolve rejects the 570 or one of the 285 coz even if Resolve rejects one of the 285 and you end up with 2 x 285s and 1 x 570, everything will still run at the slowest GPU speed, which is the 285.

It would be nice to use the 570 as the GUI in this case but the fear is that the GT120 might end up being one of the GPU and everything runs at that speed which will suck big time.

-chrispy


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Chris Martin
Re: GPU mixing and the Cubix
on May 30, 2012 at 2:30:32 pm

Robbie and Dan,

Just to make sure I'm getting this right - the reason for pulling the 120 card is that even though it is the GPU running the GUI that it's speed will determine the speed of all other GPU's running Resolve?

Or are you just referring to the slowest card in in chain of multiple GPU's that are being used for processing?

Thanks, Chris


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Juan Salvo
Re: GPU mixing and the Cubix
on May 30, 2012 at 3:10:35 pm

The gt120 doesn't factor in at all. The slowest common denominator only applies to processing.

Online Editor | Colorist | Post Super | VFX Artist | BD Author

http://JuanSalvo.com


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Chris Martin
Re: GPU mixing and the Cubix
on May 30, 2012 at 4:22:49 pm

Thanks Juan for the clarification.


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