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What happens when you have multiple GPUs setup in a system without SLI and you run a monitor off of each GPU independantly?

For example: Say I have Monitor A and Monitor B plugged into GPUs A and B. Run the OS in Extended Display Mode and finally open a 2D or 3D graphgical application where the application's window is half way on both Monitor's A & B?

My speculation: Only one GPU will render. OR Each GPU fully renders the application on it's respective display and anything outside of the GPUs' display bounderies is truncated.

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At least for all the Windows and Linux versions I'm familiar with: only one GPU will render. When it finishes rendering a frame, the parts of that frame that are on the other display will be sent, through the motherboard, to the other graphics card's frame buffer.

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