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Before installing a graphics card, I was working on a very weak intel card. I tried to render a scene but the quality of the image was poor and it took 1 minute to render.

After buying and installing Nvidia GT 710, I tried to render the same scene and I was expecting to get better results but I got the same results.

It seems that blender doesn't use my new graphics card. How do I know which card does blender use? How to switch between them?

Edit:

I like the answer but I only have the CPU option. Version: 2.73a linux 64-bit.

enter image description here

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In Blender head to File -> User Preferences -> System.

At the bottom left under "Cycles Computer Device" choose "CUDA" and you should see your GPU underneath. You need to be using the Cycles render engine for this to take effect.

enter image description here

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  • $\begingroup$ Thank you so much for your answer. I wanna give it the best answer but I can't find this option. I put a screenshot in the question. $\endgroup$ – user2824371 Oct 17 '18 at 15:01
  • $\begingroup$ You may want to upgrade to the latest version of Blender if you are able, which is 2.79b at the time of this post. You can do that here: blender.org/download You may also need to install the latest nVidia drivers to support CUDA functionality. $\endgroup$ – stom Oct 18 '18 at 5:02

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