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The Intel® Xeon® Processor E3-1231 v3 does not have any graphics built-in so the video that you see in your screen is provided by the NVIDIA card you have installed in the machine.
You can see the processor specifications here:
You can also see how to connect two or more monitors at the following link:
NOTE: This link is being offered for your convenience and should not be viewed as an endorsement by Intel of the content, products, or services offered there.