You cannot add a display card to a laptop yourself. Mostly laptops are not designed for gaming. The ones which are designed for gaming already have a good display card which can handle pretty much any game. Look for Laptop specifically designed for gaming such as the DELL ALIENWARE.
The word "laptop" and "gaming" never belong in the same sentence. If you want to game then for best results and for a best buy you would need a tower. Laptops are always one, if not a few steps behind towers.
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