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Graphics cards compatible with Alienware M18x R3

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Hi all:


I have a t about the graphics card compatibility in my Alienware M18x R3.


I come from this thread:


The main problem I have now is that I don´t know if the graphics cards equipped in my laptop are fully compatible with Alienware systems. 
It was bought in a second-hand market and, when introducing the service label on the Dell website, I saw that the configuration of the
original graphic cards is different from the current one. 

The original configuration mounted an Nvidia 765M SLI graphics card and the laptop comes with a 780M graphics card.

How can I know if this 780M was restored from another non-Alienware laptop? 

The problem is that the 780M graphics cards work well on an external monitor, so it is not on the local LCD screen:


Any suggestions or comments will be appreciated.


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