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NV3.2 and multiple CUDA cards, results!

 
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gyromedia



Joined: 15 Jun 2012
Posts: 2

PostPosted: Fri Jun 15, 2012 7:56 pm    Post subject: NV3.2 and multiple CUDA cards, results! Reply with quote

Hi, just got my setup ready. 1 Cubix box, with 1 redRocket and 3 GTX570 2.5GB cards.
On a MacPro 24Cores(HT). OS X.7.4, FCPX10.0.5

Running the optimize performance I get:

Radius = 0 => 21.7 fps (04 CPU cores, and 2 x GTX 570)
Radius = 1 => 11.6 fps (10 CPU cores, and 1 x GTX 570)
Radius = 2 => 09.9 fps (10 CPU cores, and 1 x GTX 570)
Radius = 3 => 08.4 fps (07 CPU cores, and 3 x GTX 570)
Radius = 4 => 07.5 fps (12 CPU cores, and 3 x GTX 570)
Radius = 5 => 06.5 fps (15 CPU cores, and 3 x GTX 570)

So does the CUDA acceleration scale well? I don't know, what should we expect...

Looking at the graph of it, shows a big dump from 0 to 1 radius, and therefrom, only a low decrease...

So how important is the radius parameter, is it different on very different shots?

Codecnoise VS. old, scruffy VHS noise i.e. ???

cheers Helge
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NVTeam



Joined: 01 Sep 2005
Posts: 2237

PostPosted: Fri Jun 15, 2012 9:20 pm    Post subject: Reply with quote

Please kindly post the complete log from Optimize for some typical parameters like: 1920x1080p, rad=1, 32-bit.

If I understand correctly, when running in an expander box, all the cards are still connected through a single PCIe slot of the Mac, and that may be the bottleneck in this case. If they were individually connected to separate PCIe slots of the Mac, without the expander, perhaps that would allow to achieve better speed with 2 and 3 GPUs. You may want to try that for a test.

Thank you,
Vlad
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gyromedia



Joined: 15 Jun 2012
Posts: 2

PostPosted: Sat Jun 16, 2012 6:58 am    Post subject: Reply with quote

Hi Vlad, it's not possible to do it without an expander, due to limitations of power, each card comsume 550W max and uses two pwerconnections... so in my mac I can only have one GPU card at the time...

I'll run the tests again and post the full results... next week.

/Helge
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