I've got a Dell Latitude E6430 with the integrated Intel HD 4000 graphics, but I want an upgrade. I've heard that there is a WWAN slot that is an mPCIe slot. Does that mean I can attach an mPCIe graphics card to my machine, or is there a separate slot for the GPU (some E6430's had Nvidia Quadro NVS 5200M graphics)?

In addition, assuming I could get mPCIe graphics working, would it have to be the same NVS 5200M, or would any mPCIe GPU, considering they all adhere to the same basic VGA protocols?