Vram size for Octane Tweet

[g0ss]

Hello.

At the moment I'm working in a keyshot, but I want to switch to Octane. I am choosing a graphics card. According to OctaneBench, 2080x2 is better than 2080ti, but the 2080 has less video memory than the Ti version. I usually work in 3D coat / ZBrush and the scenes are pretty heavy (30-100 million polygons).

Please tell me, how much VRAM is needed for such scenes and is the video memory from 2 video cards or more added up?

Thanks!

[bepeg4d]

Hi,
good question!
VRAM amount is often underestimated by Octane users, but it is crucial for speed.
If the scene does not fits into VRAM, part of it has to be moved to system RAM (Out-of-core).
And since RAM is slower than VRAM, you lose ~20% of rendering speed, and the system is less reactive.

About adding 2x GPUs/VRAM, NvLink works only with RTX GPUs, and only for geometry at the moment.
Textures must be moved to system RAM (Out-of-core), losing speed also in this case.

You are working with pretty dense scenes, and I don't think that 11GB would be enough for some of them, so maybe you could wait till 1st of September to see what Nvidia is going to do about VRAM with the upcoming Ampere architecture.
On the other side of the river, AMD is offering GPUs with 16GB fast VRAM at a reasonable price.

ciao Beppe

[LeJiaqi]

Hi,
good question!
VRAM amount is often underestimated by Octane users, but it is crucial for speed.
If the scene does not fits into VRAM, part of it has to be moved to system RAM (Out-of-core).
And since RAM is slower than VRAM, you lose ~20% of rendering speed, and the system is less reactive.

About adding 2x GPUs/VRAM, NvLink works only with RTX GPUs, and only for geometry at the moment.
Textures must be moved to system RAM (Out-of-core), losing speed also in this case.

You are working with pretty dense scenes, and I don't think that 11GB would be enough for some of them, so maybe you could wait till 1st of September to see what Nvidia is going to do about VRAM with the upcoming Ampere architecture.
On the other side of the river, AMD is offering GPUs with 16GB fast VRAM at a reasonable price.

ciao Beppe

So 20GB vram 3080ti and 24GB vram for 3090 is true ???
And I got a question about PCIe. I got some "information" said Nvidia high-end GPU is gonna need pcie4.0x16 to feed it. Is that matter coz I gat only 3.0x16? Will it slow down the rendering?

[glimpse]

:o So 20GB vram 3080ti and 24GB vram for 3090 is true ???
And I got a question about PCIe. I got some "information" said Nvidia high-end GPU is gonna need pcie4.0x16 to feed it. Is that matter coz I gat only 3.0x16? Will it slow down the rendering?

I doubt that would be the case. for now, all we have is some rumors and guesses, that a based on nothing.

in Your situation, with so heavy files I would look at least into 2080ti or even TitanRTX.