All in one PC Graphics Card Question

[Big_Boi]

I have recently bought the Lenovo B50-30 Touch all in one pc, I went for the cheaper option with the intel integrated graphics and I really want to upgrade the graphics. Therefore I was wondering if there is any way of being able to add a new more powerful graphics card baring in mind that the PC is an all in one model

 

[GhislainG]

Where would you connect the GPU? Could you at least buy and install the NVidia GT840A? I presume that you're not a gamer; otherwise you would have bought a desktop.