Upgrading my graphics card in AlienwareM15x

upgrading my laptops graphics card wanted to double check compatibility here's a screenshot of SIW
and the card I'm buying.

if you would like to see any other specs just request.

The 670M will certainly be an upgrade, the worry I have here is the power supply within the laptop. I don't know that much about PSUs in laptops but it would be well worth your while to check whether your computer will handle that new GPU.