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680s, 780s, Titans
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Just to reinforce a couple things Juan has mentioned….
Mac can now with latest OS and drivers def. do 5 cards. I’m running it now. Couldn’t get it to work at first SMC reset has done the trick.
Like Juan, in a Super Micro PC as well as a RAIN system, I had trouble with more than 2 cards on the mother board and boots etc. Seems like the gaming systems with 3 or 4 cards are working SLI which Resolve doesn’t support. Cubix has been the only thing thats worked in reliable fashion and yes the bandwidth thing is NOT an issue thanks to clock sharing – data is passed to the card and the clock sharing ensures data is passed off from the card to the bus in separate intervals thus each card works at full bandwidth
Also the thing with cores etc etc. Its all about card design in balance with the application. Just look at something like SpeedGrade vs Resolve. SpeedGrade is built around quadro cards. Resolve works best with GTX cards. A while back everyone was hot to trot on Q4000 and they were WAY slower than GTX cards that cost half as much and probably had less cores!. Its a balance for sure
Finally, gotta say I’ve been relying on Juan for years about NVIDIA GPUs from here on the COW and other places. He is a beta tester and and works closely with NVIDIA. I always default to his opinions and notes regarding NVIDIA GPUs. He’s 99.9% right about GPU performance.
Robbie Carman
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It tends to boil down to what someone have heard or dreamed.
Taking good advice is not for everybody as my friend says. (he is in hi end server business)
I would also go with Juans ideas as he has the experience.
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Margus
https://iconstudios.eu
https://vimeo.com/iconstudioseu/videosDaVinci 9, OSX 10.7.4
MacPro 5.1 2×2,93 24GB
GTX 470 / Quadro 4000
Multibridge 2 Pro -
Using an ASUS P9X79 WS Mobo for my PC Config. (Also have a Mac Pro w/ 210+570) You can disable SLI in the NVIDIA settings, and resolve does see all three GPUs. Honestly, you could just pull the link cable, but I like to leave it on so I can game on it occasionally. Thank God NVIDIA added the ability to disable SLI in software! At work we run Linux resolve with the 8 GPU expander attached to the Super Micro chassis, so no help there. I’m guessing that that specific motherboard & PSU can’t handle more than two GPUs reliably. Only trying to point out that if going the DIY route that it is possible to run a stable 3 GPU system.
Agree with Juan that simply counting CUDA cores is not a gauge of performance. Would an AMD 4 core vs Intel 4 core CPU comparison at identical clocks yield equal performance? Nope! There is a reason why 580’s still compare favorably to the current gen NVIDIA gaming GPUs in CUDA performance even though they have far fewer CUDA cores: Focus on gaming performance over compute when engineering the new GPUs. I Understand the reasoning (More people use their products to play games than compute), and it just validates what Juan is saying.
https://www.anandtech.com/show/5699/nvidia-geforce-gtx-680-review/17
https://www.tomshardware.com/reviews/geforce-gtx-780-performance-review,3516-26.html
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Frankly everything said here has been inconsistent and at times conflicts with Resolve published information.
The official config says 1 x GPU use 680, 2 x GPU use 680 or 1 x 690 (although they are not recommended due to a lack of RAM – they are still on the list for 4k) 4 x GPU use 580. So they don’t recommend 680 for 4 x GPU. Problem with the config is they say what to do but not what not to do (same here in this thread). They say use MB for 2 x GPU and expander for 4 x GPU but not why that is. As far as Davinci are concerned, more than 2 x GPUs are not recognised, however we have Al here saying that they can be.
Also, config says going from 1 x GPU to 2 x GPU is a double in performance (doubling of CUDA cores). It also says don’t use Quadro unless you have to as GTX is far better performance. So why? All that they have over Quadros is CUDA count. Look at the new Quadros, doubling of CUDA cores. Why?
Nvidia could not justify the price hike for Quadros and give us a bunch of marketing speak as to why they are better. But here we are with one of the most professional and GPU intensive apps in the industry and consumer cards are recommended.
When it comes to CPU, if I double the core count or the speed I get a equivalent increase in render performance. However this is only in an app that can make use of multiple CPUs. So if you ask me the question about doubling CPU cores, I can answer it concisely, but qualified by the particular application being used. So the same Q relating to AE is a little bit more complicated.
All I have from this thread is cryptic answers. Nothing here has been useful for building a Davinci in June 2013, except Als suggesting about multi GPUs and the SLI setting.
BTW Al you can compare AMD and Intel CPUs, we always could knowing the architecture and I was always able to explain it to someone. But it’s a moot point now as AMD will new catch Intel in the performance space.
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But you are right on the money here that it is not 1:1 way to go here.
It all depends on so many aspects.
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Margus
https://iconstudios.eu
https://vimeo.com/iconstudioseu/videosDaVinci 9, OSX 10.7.4
MacPro 5.1 2×2,93 24GB
GTX 470 / Quadro 4000
Multibridge 2 Pro
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