Is it possible to see the same thing on one screen while using 2 card

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vsub

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I have GTX750TI connected to the HDMI port of my monitor and HD4600 connected to the D-SUB port of the monitor.

What I'm trying to achieve is to see the same thing while switching between HDMI and D-SUB modes.
With Win+P I can switch to "Duplicate" but then the D-SUB shows black screen.

Does duplicate work only if you are using the outputs of one card not two?
 

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Do you have only 1 monitor? If yes, then why are you trying to duplicate the screen? What are you trying to accomplish?
Try duplicating from Screen Resolution window (right click empty desktop area)
 

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What`s the purpose of the HD4600 and what`s the purpose of duplicating the monitors ?

I mean, you`re not gaining anything.

Do you mean the cpu graphics (HD4600), and the vga port on the motherboard ?
 

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To duplicate one monitor onto another they need to be on the same graphics card.
 
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