What nVidia drivers are you using ?
Put it in D3D11 and native and Full Screen mode as well and post a screenshot, there is no reason this should not work.
The other GPU should not really matter, If you are plugged into the nVidia card with an HDMI cable then it should be fine, you should be able to disable it in the BIOS somewhere, you could probably do it in device manager as well I would imagine.
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