Trouble with using vram

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Magog
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Hi guys, I searched info on the forum but found nothing.
Someone explained to me briefly how the memory usage of Octane please?
I am doing a work, and I find the following statement 3135480 Tris, 3 GPUs, 620.2/739/1536Mb.
From the outset I use the driver as 296.10 today. preferences of Octane as Cuda Driver Version 4.20 and there's like the Cuda Runtime version 4.00.
Now, only with Octane started, as I have 739Mb of vram busy? where they are used and especially as you recover?
The scene is standardized, without textures and HDRI, default resolution of 1600 * 1200.

Thanks in advance for any tips and / or solutions .. (if any .. :? )
i7 970 3.3 GHz | 12Gb Ram | GTx550Ti for display + Gainward GTX580 1.5 Gb and Zotac 590 3 Gb for Octane | Win7 x64 __ Softimage 2011.5
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pixelrush
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Probably something changed in Cuda 4.2 that Octane uses to estimate vram use for your hardware.
The 700mb available probably isn't the real figure - possibly its actually the number divided by 2?
600mb for 3m tris sounds right though.
If it bothers you or it is a real issue go back to an older driver with Cuda 4.0.
Recent Octane was built with Cuda 4.0. Using Cuda 4.2 is probably getting a little ahead of the game even though Cuda is supposed to be backward compatible.
AFAIK the only Cuda 4.2 drivers available ATM are 295.51, 295.73, 296.10, 301.10.
i7-3820 @4.3Ghz | 24gb | Win7pro-64
GTS 250 display + 2 x GTX 780 cuda| driver 331.65
Octane v1.55
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Magog
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Thanks for the reply Pixelrush.
I'll try to reinstall Cuda 4.0, although it seems strange that this problem has just occurred.
Returning to CUDA 4.0, I can leave the driver 296.10?
Tomorrow I'll have the feedback.
i7 970 3.3 GHz | 12Gb Ram | GTx550Ti for display + Gainward GTX580 1.5 Gb and Zotac 590 3 Gb for Octane | Win7 x64 __ Softimage 2011.5
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pixelrush
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The nvidia driver for windows comes with cuda in it.
You don't need the toolkit for windows if that is what you have done.
Only install the driver.
For windows -
Cuda 4.0 is >=270.81 (>=275.33 for laptops) and <286.
Cuda 4.1 is >=286.19 (>=286.16 for laptops) and <295

Last whql Cuda 4.0 driver is http://www.nvidia.com/object/win7-winvi ... river.html
i7-3820 @4.3Ghz | 24gb | Win7pro-64
GTS 250 display + 2 x GTX 780 cuda| driver 331.65
Octane v1.55
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roeland
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Joined: Wed Mar 09, 2011 10:09 pm

Make sure that SLI or “multi-GPU” is switched off in the nvidia control panel if you run Octane. (it is switched on by default)

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Roeland
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Magog
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Tnx for tips!!!
I switched off the multi-Gpu, now the value is 3135480 Tris, 3 GPUs, 737.4/1376/1536 MB with various material and textures!

Tnx a lot !!!!
i7 970 3.3 GHz | 12Gb Ram | GTx550Ti for display + Gainward GTX580 1.5 Gb and Zotac 590 3 Gb for Octane | Win7 x64 __ Softimage 2011.5
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