OTOY Forums

Posted: **Tue May 31, 2011 12:52 pm**

kaitwm wrote:Ok,

as I already mentioned I changed my system configuration to just two 580s instead of adding an extra 550ti for display, to get the two 580s running in pci express 16x mode. Initally I did that because I never got octane to use more than 50% gpu load on any card. Now it seems a bit better, but still the gpu load does not exceed 56% on one and 49% on the other 580.

Is there something I did wrong in the octane preferences? I left everything on default except that I put both 580s in the "active" panel in the cuda devices.

PS.: For testing purposes I tried cycles and it uses up to 96% gpu load. Of course only on one 580, since cycles doesn´t support multiple gpus, I think.

I'm guessing that Beta V2.5 due soon may solve this problem.( Hopefully

)

Posted: **Tue May 31, 2011 1:08 pm**

Hi Jaberwocky,

so you´d say this is more or less a limitation of the current version of octane rather than a wrong hardware configuration?

Posted: **Tue May 31, 2011 11:14 pm**

The CUDA 3.2 build has a problem with using more than one GPU, if you render with multiple GPU's, use the CUDA 3.0 build.

--
Roeland

Posted: **Wed Jun 01, 2011 6:59 am**

Hi Roeland,

thank you for this tip. I shoulld have read the instructions in the download area more carefully.

With the cuda 3.0 build I get 76% and 97% gpu load, renders a bit faster now.

(Rendertime went down from 08:09 to 05:49 minutes to get to 2048 s/p, the scene has 352964 faces, a resolution of 1920 x 1080p, pathtracing with 8 bounces, various textures including bump and is illumitated by an hdri map.)

Kind regards, Kai

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