My understanding is that if I add a video card to a PC system that onboard (motherboard) video becomes unusable.

Why is that? Is there a way to use both?

marked as duplicate by Karan, magicandre1981, CharlieRB, soandos, Breakthrough Jun 23 '13 at 20:31

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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    @Karan except if he is asking why it disables, not how to use both... then the question should be OK and updated... But how to use both, yes you can google that or read your two articles. – Austin T French Jun 22 '13 at 1:44
  • @AthomSfere: Except the accepted answer to the second question I linked to above tells you why. – Karan Jun 22 '13 at 1:53
  • @Karan, but is the same or similar answer the same as the same question? I suppose a close as duplicate ultimately points to the old question... – Austin T French Jun 22 '13 at 2:00
  • @AthomSfere: "is the same or similar answer the same as the same question" - Huh? IMO the OP's query is answered by the linked questions, but if it isn't he's free to edit his question to clarify at any time. – Karan Jun 22 '13 at 2:03