3 x SLI GTX 980 - Error

[bleepurchin]

Hi there,

I've recently added a third GTX 980 to my system which required me to change the mother board from an Asus X99 to a Rampage V.

I have found that on smaller scenes the three cards work great. However on this larger scene I 'm working on now I cant get the three cards to work without this error appearing and C4D crashing:

Screenshot (7).png (10.36 KiB) Viewed 2923 times

I've changed the TdrDelay from 2 seconds to 20 which hasn't helped:

If I only use two cards the problem doesn't seem to occur when using C4D picture viewer but it does occur when using the live viewer and I get this windows message (bottom right). After this message appears the viewer becomes inactive:

Scene details:
Mesh: 462
Links:178
Mats:26
Mot:1235

Any idea whats going on please?

Thanks!

[aoktar]

Great feedback. Do you see ms/sec value? It's very very low. Very slow. What caused this? Are you having SLI enabled? Can you share your scene with me?

[bleepurchin]

Hi Aoktar,

Thanks for responding so quick.

I would love to share my scene with you but its almost 500MB big. Is that possible somehow?

I think I have SLI active... but I cant be sure as I only know this setting:

I dont know why the ms/sec value is slow... it always takes a long time to upload to octane... the image below shows the scene before it crashes...

The only thing I can think is that I have NitroBaked my X-particle trails which makes a lot of single meshes for each frame - would that be a reason?
(This image is the layer in solo)

[aoktar]

1- Much triangles takes much time to compile and prepare to renderer. Check and use low subdivisions for render mode. you should always use low poly as you can do.
2- Displacement can make this kind of slowness. Try without displacement and don't use high values.
3- Many objects which are movable can make it slow. But not so much.
4- Disable sli. It's not recommended for Octane.

Why 500mb? Have much textures? give it without textures but i can't check weekend. My plan is not clear at the moment.

[bleepurchin]

Why 500mb? Have much textures?

No the scene file only includes geometry. I think its just a lot of objects that make it large. I will try and send you the scene file anyway... maybe if you have good internet you can download it?

I had no idea that SLI was bad for Octane... I thought that was the way the three cards work together. I will turn it off.

I have stripped my scene down as much as I can without compromising it.

I have no displacement in my scene.


Ok I have just tried rendering to picture viewer with 3x GPUs with SLI turned off and I still get application crash:

[aoktar]

I think you're exceeding limitations. I can't calculate exact count of triangles,etc.. before sending. you should read my advices and try to find what's exploding the engine. simply do some tests as doing other renderers by hiding somethings. also I have a fast download.

[bleepurchin]

I think you're exceeding limitations. I can't calculate exact count of triangles,etc.. before sending. you should read my advices and try to find what's exploding the engine. simply do some tests as doing other renderers by hiding somethings. also I have a fast download.

Thanks Aoktar, I will see if I can make two separate scenes and composite the renders together.

I understand that there will be no polygon restriction in Octane 3. Will it therefore be more stable with larger scenes like this one?

Thanks again.