12 GPU Limit

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smicha
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electric_eric wrote: Hey,

I currently have 8 x 980ti recognised in device manager however only 7 cards show up in Octane or Geforce Experience.

I have the same motherboard as you and I'm running windows 8.1 64bit.

Did you have to disable much in the bios to get these 9 cards working?

Any help on this would be much appreciated as I currently have a 980ti sat on the table doing nothing!!

Thanks in advance.
Your i2500k has 16 pci-e lanes, not 40 as 4930k. So this may be the reason why you cannot get 8 gpus working. But this is just a hint, not sure about it. We've written about it a lot at Tutor's topics.
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electric_eric
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I should mention this is a different PC I'm talking about so ignore my profile spec.

In the system I'm talking about we have a Intel Core i7 4820K Quad Core processor.

Cheers.
Intel i7 6700k - 64gb Ram - 6 x 980ti
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smicha
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electric_eric wrote:I should mention this is a different PC I'm talking about so ignore my profile spec.

In the system I'm talking about we have a Intel Core i7 4820K Quad Core processor.

Cheers.

So again: 4820k had 28 pcie lanes and this would allow for only 7 gpus in x4 mode...
3090, Titan, Quadro, Xeon Scalable Supermicro, 768GB RAM; Sketchup Pro, Classical Architecture.
Custom alloy powder coated laser cut cases, Autodesk metal-sheet 3D modelling.
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electric_eric
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http://ark.intel.com/products/77781/Int ... o-3_90-GHz

If you look at the expansion options here it states that it has "Max # of PCI Express Lanes 40"
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smicha
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Oh, I thought that 4820 has same as 5820. So this must have something common with IO space.
3090, Titan, Quadro, Xeon Scalable Supermicro, 768GB RAM; Sketchup Pro, Classical Architecture.
Custom alloy powder coated laser cut cases, Autodesk metal-sheet 3D modelling.
build-log http://render.otoy.com/forum/viewtopic.php?f=9&t=42540
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electric_eric
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IO space? What does that mean exactly?

The thing that's baffling me is that there are 8 GPU's in device manager all of which have "working properly" status, which suggests to me that they are installed correctly.

Not sure why all 8 wouldnt then show up in Octane device list.
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electric_eric
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Could it be a RAM issue?

We have 32GB of RAM installed for 8x 6GB cards. I've heard that recommended is 2-3 times the GPU memory but is that 'combined' memory?
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smicha
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In this topic
http://render.otoy.com/forum/viewtopic. ... ilit=tutor

you'll find very useful info. Tutor is a great helper, so I believe he'll give you some hints.
3090, Titan, Quadro, Xeon Scalable Supermicro, 768GB RAM; Sketchup Pro, Classical Architecture.
Custom alloy powder coated laser cut cases, Autodesk metal-sheet 3D modelling.
build-log http://render.otoy.com/forum/viewtopic.php?f=9&t=42540
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electric_eric
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Thanks, that's been a great help.

We now have 8 cards working :)

Now for number 9.
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smicha
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electric_eric wrote:Thanks, that's been a great help.

We now have 8 cards working :)

Now for number 9.

Great news. What actually caused the problem?
3090, Titan, Quadro, Xeon Scalable Supermicro, 768GB RAM; Sketchup Pro, Classical Architecture.
Custom alloy powder coated laser cut cases, Autodesk metal-sheet 3D modelling.
build-log http://render.otoy.com/forum/viewtopic.php?f=9&t=42540
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