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I have two identical gpu's. When opening the compute device menu in system settings, there are two identical entries. I'd like to select the one that isn't being used - is there a way to do this?

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I think this is a trial and error kind of question. Choose one of the GPUs on the list:

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And do a render test. Using an external application to monitor the GPU usage you can determine which card is being used to render.

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In my case the one on the bottom of the list in blender is GPU1, but it might be different on your system.

Now, I would recommend enabling both cards to render... Even with the load of the display, it might cut your render time almost in half...

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  • $\begingroup$ @cegaton I have a windows/nvidia with a GTX970 card. Is is always possible to install a second GXT970 card ? Now I have started rendering animations I am interested :) $\endgroup$ – Old Man Mar 5 '16 at 11:57
  • $\begingroup$ As long as you have adequate power and cooling in your host computer, you can add multiple GPUs. To use in blender you don't need SLI. read: blender.stackexchange.com/questions/5228/… $\endgroup$ – user1853 Mar 5 '16 at 15:31

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