Hi, I just bought a new desktop *ACER AZ3-715-UR51 23.8” AIO. Intel i7-6700T and 16gb RAM) It has Intel integrated graphics, and 4 USB 3.0 ports. Can I buy an external card and intall/use it that way? Or must it be used in a PCI slot? (which it doesn't have if I'm reading the specs right). Also...