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sean ross
multiple video cards on mac
on Oct 17, 2013 at 7:06:55 pm

Hi guys,
I have a question. My hardware vendor told me that Davinci cannot use more than two video cards (plus the GUI card which makes 3) in accellerating video on a macintosh. Is this true?

I have a cubix expander, and have space for a third gtx 680, and would like to put one in if it makes sense...

thanks,
Sean


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jake blackstone
Re: multiple video cards on mac
on Oct 17, 2013 at 9:34:27 pm

This limitation only applies to the Lite version. On paid version you can use more than 2 GPUs. I have Cubix with 2 GTX 680s in it in addition to GTX 570 in the computer.


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Massimo Alberto Croce
Re: multiple video cards on mac
on Oct 17, 2013 at 9:45:52 pm

read about it on page 35 DaVinci Resolve Config Guide.

Massimo Alberto Croce
Video Editor, Colorist, Pro Tools Editor
massimoalberto.croce@gmail.com


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sean ross
Re: multiple video cards on mac
on Oct 18, 2013 at 2:32:56 pm

Thanks for your quick responses. Let me rephrase what I was asking, as I have read the gpu guide and do have a Cubix Expanded system. Its just that my hardware supplier was saying that Resolve doesn't really see a performance advantage to having more than 2 CUDA enabled cards plus the GUI card on a system (I want to put in a third). I have not heard that anywhere else, and I was wondering if anybody else could corraborate this.

thanks,
Sean


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jake blackstone
Re: multiple video cards on mac
on Oct 18, 2013 at 7:12:05 pm

Can you state clearly what GPU cards you have installed right now. I'm having trouble understanding your hardware set up.


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sean ross
Re: multiple video cards on mac
on Oct 18, 2013 at 7:31:28 pm

I have 2 GeForce GTX 680 cards as well as an ATI Radeon HD 5770 for my GUI. I want to put in 3 of the GTX 680 cards and I have been told that it is a waste.


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jake blackstone
Re: multiple video cards on mac
on Oct 18, 2013 at 10:15:48 pm

You'll be hard pressed to stress your two existing 680s as is. On the other hand in version 10 you'll need all the power you can squeeze into your computer. With my three CUDA cards (570+2x680) a single Bleach bypass OFX filter causes non-real time playback. So, yes, an extra 680 will come very handy in V10. And don't forget the upcoming Red GPU debayer.


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Eric Fiegehen
Re: multiple video cards on mac
on Oct 22, 2013 at 8:04:54 pm

Hi Sean,

Below is some performance data for reference purposes from a Cubix customer located in Montreal using Resolve 9.x:

SETUP 4K

CONFIGURATION :

MAC PRO :
- Quadro 4000 - (GUI)
- Declink 4K
- Fibre Channel Cart
- CUBIX card

CUBIX Dual-wide slots:
- 1 red rocket
- 3x GTX 680 (4GB of RAM)


- OPTIMISE DISPLAY ON + DON'T UPDATE INTERFACE ICONS ON

-- 4K R3D Full res premium 10 bit (TIMELINE 3840x2160 / SOURCE 4K Output: 3840 x 2160)
- PLAYBACK : 24 FPS
- NODES BLUR: Drop @ 11 nodes

-- 5K R3D HALF res premium 10 bit (TIMELINE 4K 3840x2160 / SOURCE 5K Output: 3840 x 2160)
- PLAYBACK : 24 FPS
- NODES BLUR: Drop @ 11 nodes

-- 4K F65 FULL res (TIMELINE / SOURCE 4K Output: 3840 x 2160)
- PLAYBACK : 24 FPS
- NODES BLUR: Drop @ 5 nodes

-- 4K F65 HALF res (TIMELINE / SOURCE 4K Output: 3840 x 2160)
- PLAYBACK : 24 FPS
- NODES BLUR: Drop @ 9 nodes

-- .CINE (PHANTOM UNPACK) (TIMELINE HD / SOURCE HD)
- PLAYBACK : 24FPS
- NODES BLUR: 14+


-- ARRIRAW (TIMELINE / OUTPUT HD + SOURCE 2K)
- PLAYBACK : 24 FPS
- NODES BLUR: 17+


-- BMC (TIMELINE / OUTPUT en HD + SOURCE 2K)
- PLAYBACK : 24FPS
- NODES BLUR: 17+

-- PENELOPE (TIMELINE 3512x1960 OUTPUT 4K / SOURCE 3K)
- PLAYBACK : No real timeā€¦ Disk speed

SETUP RED 5K

MAC PRO :
- Quadro 4000 - (GUI)
- Declink 4K
- Carte fibre
- Carte Cubix

CUBIX Expander Desktop :
- 2x red rocket
- 2x GTX 680 (4gb)

- OPTIMISE DISPLAY ON + DON'T UPDATE INTERFACE ICONS ON


-- 5K R3D FULL res premium 10 bit (TIMELINE 4K 3840x1609 / SOURCE 5K Output: 3840 x 2160)
- PLAYBACK : 24 FPS
- NODES BLUR: Drop @ 1 nodes

-- 5K R3D HALF res premium 10 bit (TIMELINE 4K 3840x2160 / SOURCE 5K Output: 3840 x 2160)
- PLAYBACK : 24 FPS
- NODES BLUR: Drop @ 6 nodes

-- 4K R3D Full res premium 10 bit (TIMELINE 3840x2160 / SOURCE 4K Output: 3840 x 2160)
- PLAYBACK : 24 FPS
- NODES BLUR: Drop @ 6 nodes

-- 4K R3D HALF res premium 10 bit (TIMELINE 3840x2160 / SOURCE 4K Output: 3840 x 2160)
- PLAYBACK : 24 FPS
- NODES BLUR: Drop @ 6 nodes

-- 4K PR 4444 (TIMELINE 4K 3840x2160 Output: 3840 x 2160)
- PLAYBACK : 24 FPS
- NODES BLUR: Drop @ 3 nodes

-- 4K PR 4444 (TIMELINE HD Output HD)
- PLAYBACK : 24 FPS
- NODES BLUR: Drop @ 16 nodes

-- 4K F65 FULL res (TIMELINE / SOURCE 4K Output: 3840 x 2160)
- PLAYBACK : No RT
- NODES BLUR:

-- 4K F65 HALF res (TIMELINE / SOURCE 4K Output: 3840 x 2160)
- PLAYBACK : 24 FPS
- NODES BLUR: Drop @ 5 nodes

-- ARRIRAW (TIMELINE / OUTPUT HD + SOURCE 2K)
- PLAYBACK : 24 FPS
- NODES BLUR: 17+

Let me know if there is any additional information we can provide.

Eric Fiegehen
Director, Visualization & GPU Compute Solutions
Cubix Corporation
ericc@cubix.com
http://www.cubix.com


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sean ross
Re: multiple video cards on mac
on Oct 22, 2013 at 8:25:46 pm

Thanks Eric that is incredible. I put the 3rd 680 in my cubix today just before reading this, and I'll leave it there!!!


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Matt Perrin
Re: multiple video cards on mac
on May 24, 2014 at 1:18:28 am

Seeing that the last post on this forum is 7 months old, I wanted to ask about the same question but in regards to the latest version of Resolve and the new Red Dragon 6K files. I have a similar setup with a Cyclone expansion chassis with two 680's. Since my Red Rocket won't work with Dragon footage, I thought about adding one or two more 680's in place of the Rocket. Since I am stuck with my 12 cores, will adding more 680's give me faster transcoding speeds of Red and Alexa footage or not. I am currently getting 17 fps while transcoding 5K full res debayer to Pro Res 422 HQ, that is with the Rocket disabled to accommodate Dragon footage and the Resolve setting to use GPU's to process Red footage. Thanks for any info or suggestions on how to speed up transcoding without going to a faster processor (new computer).


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