I have a asus Rog Gr6 ( https://www.asus.com/us/Mini-PCs/ROG_GR6/ ) . It is a mini Pc with okay specs except the gpu. i bought this PC a year ago for school but now im getting into gaming and this gtx 960M is not cutting it. I need to upgrade the GPU but i dont not have the money to buy a whole new rig. Is a external GPU a thing and if so would it be compatible with my PC? Thank you