I am an happy owner of a Dell 5404 Rugged (2014) and I recently found out there is the possibility of a dedicated GPU upgrade to my current system. 

In the specs sheet it says there is supposed to be a Nvidia GeForce 720m, but I checked and nothing is installed in my Motherboard. I found online a replacement part for it, apparently is a Dell Card called 27Y72. Here is the link: https://www.ebay.com/p/7031239504 

My problem is I can't figure out what kind of port it uses and if I am stucked with this card only as possible upgrade or I can insert "newer" cards on it. This is a picture of the empty port in the motherboard: 

 

 

 

Is it a mini PCIe, MXM or a proprietary slot used only by Dell, perhaps only on this model?