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VRAM restriction
Posted: Sun Jun 09, 2013 11:20 pm
by mjk
Hello everybody!
I hope to find an answer to my questions in this forum.
This week, I have purchased Octane and a GTX Titan for rendering and have plans to add another one.
Since Titans are quite pricey I was thinking of acquiring the new GTX 780 perhaps.
As described in the FAQs no SLI needed. Right!! - But will the 6 GB VRAM on the Titan
be limited by the 3 GB on the GTX 780 and thus limiting the possibility for large "6GB scenes"??
If so, isnt't there a "workaround"?
And that prompts me to another question...
How many polygons and textures actually do fit into 6GB of VRAM?
What kind of project-scale are we talking about?
Kind regards,
Michael
Re: VRAM restriction
Posted: Mon Jun 10, 2013 2:40 am
by UnCommonGrafx
No workaround; that would be the limit.
Best get another Titan to utilize the full 6 gb.
As to what's allowed, I've seen it but I don't recall.
Re: VRAM restriction
Posted: Mon Jun 10, 2013 8:17 am
by gordonrobb
It would be limited to the lowest VRAM of the active card. So you could still benefit from the 780 in scenes that were small enough. If your scene was too big, you can tell octane to only use theTitan. You'll take a speed hit, but be ale to render.
Re: VRAM restriction
Posted: Mon Jun 10, 2013 8:58 am
by glimpse
"At the moment most #GPUs are limited by their amout of VRAM, to render 26 million triangles you need around 4GB of VRAM." Roeland .@OTOY
Re: VRAM restriction
Posted: Mon Jun 10, 2013 2:36 pm
by SimonJM
With a simple ground plane using an LiveDB texture I managed to get 12 Genesis figures rendered (unclothed!) but otherwise all fully textured (using different texture maps) using the OcDS plug-in, all within the 4GB of VRAM in my GTX 680M. Admittedly there was not much VRAM left
Re: VRAM restriction
Posted: Mon Jun 10, 2013 4:32 pm
by LudovicRouy
another good information that may be usefull in the voxelisation process is which amount of Ram do I need for each Go of Vram ? (without using virtual memory)...
Re: VRAM restriction
Posted: Mon Jun 10, 2013 5:16 pm
by gordonrobb
What is voxilisation?
Re: VRAM restriction
Posted: Mon Jun 10, 2013 5:29 pm
by LudovicRouy
Its the step before rendering, the geometry is "converted" by CPU then sended to the GPU.
In very huge scenes this could be time consuming especially if you use virtual memory in case of a lack of RAM.
Re: VRAM restriction
Posted: Wed Jun 12, 2013 5:28 pm
by mjk
Thank you all for your response!
Re: VRAM restriction
Posted: Fri Jun 14, 2013 12:38 pm
by Slayerma
glimpse wrote:"At the moment most #GPUs are limited by their amout of VRAM, to render 26 million triangles you need around 4GB of VRAM." Roeland .@OTOY
I worked on a scene with 20M + polygons and the standalone wouldn't start render, it show 32M tri and maybe much more.
So that's mean i can't upload more the 26M tri limit ?? I have a Titan for GPU