[kitguru] Nvidia: ‘Pascal’ architecture’s NVLink to enable 8-way multi-GPU capability - Overclock.net - An Overclocking Community

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[kitguru] Nvidia: ‘Pascal’ architecture’s NVLink to enable 8-way multi-GPU capability

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post #1 of 80 (permalink) Old 03-19-2015, 08:01 AM - Thread Starter
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Compute performance of modern graphics processing units (GPUs) is tremendous, but so are the needs of modern applications that use such chips to display beautiful images or perform complex scientific calculations. Nowadays it is rather impossible to install more than four GPUs into a computer box and get adequate performance scaling. But brace yourself as Nvidia is working on eight-way multi-GPU technology.

The vast majority of personal computers today have only one graphics processor, but many gaming PCs used to play games integrate two graphics cards for increased framerate. Enthusiasts, who want to have unbeatable performance in select games and benchmarks opt for three-way or four-way multi-GPU setups, but these are pretty rare because scaling beyond two GPUs is not really high. Professionals, who need high-performance GPUs for simulations, deep learning and other applications also benefit from four graphics processors and could use even more GPUs per box. Unfortunately, that is virtually impossible because of limitations imposed by today’s PCI Express and SLI technologies. However, Nvidia hopes that with the emergence of the code-named “Pascal” GPUs and NVLink bus, it will be considerably easier to build multi-GPU machines.

 

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post #2 of 80 (permalink) Old 03-19-2015, 08:06 AM
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Wasn't 8-way multi-GPU already supported for Quadro's? I don't see this making sense for anything other than maybe titans.
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post #3 of 80 (permalink) Old 03-19-2015, 08:13 AM
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How is multi-GPU scaling with split frame rendering these days? AFR scaling gets worse going to 3 or 4 way (even if you're not stuck in cpu bound wall which happens with todays API's)

I can imagine just dividing the screen into 4-8 sections not being so bad compared to having to queue 4-8 frames deep, with inefficiencies and loss due to frame pacing. Alternate frame rendering is not very scalable - 3 way GPU is already very laggy - but other methods might be

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post #4 of 80 (permalink) Old 03-19-2015, 08:17 AM
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post #5 of 80 (permalink) Old 03-19-2015, 08:18 AM
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If they say they can do it in the new architecture then who are we to say otherwise? I don't think any older architecture for scientific cards applies here to new and undisclosed architecture.


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post #6 of 80 (permalink) Old 03-19-2015, 08:21 AM
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post #7 of 80 (permalink) Old 03-19-2015, 08:21 AM
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Would power scaling go down...for pascal. We still are not off 28nm and the benefits of Maxwell power efficiency were pretty good. And this doesnt sound like something the "Average" user would use in any case.

 

I keep asking if we would ever get to the point where fluid dynamics would be possible. Maybe.


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post #8 of 80 (permalink) Old 03-19-2015, 08:25 AM
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Nowadays it is rather impossible to install more than four two GPUs into a computer box and get adequate performance scaling.

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Seriously, outside of professional compute applications, this news is irrelevant. It would be much better to hear "3 and 4 way SLI will now scale properly in nearly all games!" than "now you can put 8 cards in your system in SLI!"

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post #9 of 80 (permalink) Old 03-19-2015, 08:26 AM
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How is multi-GPU scaling with split frame rendering these days? AFR scaling gets worse going to 3 or 4 way (even if you're not stuck in cpu bound wall which happens with todays API's)

I can imagine just dividing the screen into 4-8 sections not being so bad compared to having to queue 4-8 frames deep, with inefficiencies and loss due to frame pacing. Alternate frame rendering is not very scalable - 3 way GPU is already very laggy - but other methods might be

If latency is low enough it'd probably work well, like tile-based rendering

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post #10 of 80 (permalink) Old 03-19-2015, 09:00 AM
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