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Old 07-16-10, 11:19 AM   #3
Stephen Warren
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Default Re: How to tell which GPU is used to render?

If you have physically separate X screens without Xinerama, they're named ":0.0", ":0.1", and ":0.2". Perhaps try experimenting with those DISPLAY values? But, if it's displaying on the screen physically connected to the faster GPU, it's extremely likely it's rendering there. Xinerama might complicate things; I forget exactly how that works in OpenGL.
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