Only you can make the call, but there is no other hardware in the system that's usable as a video input from an eGPU. For that matter, you can buy a complete, used desktop system at least ten years newer than this Alienware for under $100 -- which will run rings around anything you can jerry rig with this notebook.  
Using an eGPU on an Alienware M9700 II know I can't game on it. I just want to use it as a media center. So I will be hooking it up to my Tv to watch shows and movies. The internal gpus of course, overheat , as they are ancient. SO, I want to go the external route, IF possible. The riser is cheap. The card doesn't have to be monstrous. All I REALLY need to know, is if I can adapt the Express Card Slot /54mm as an output. I can get an adaptor that turns into USB 3. It will probably only run at usb2 speed. Can I then usb into the riser card? Or can any bright soul tell me if it is even possible with a different adapter? I am going to be loading Tiny 10 onto it and two new ssd drives. It has the max of 2 gig of ram in it. If I spend a hundred bucks in parts, that's fine. I just dont want to throw this out. It was a very expensive piece in its day. And it still works. Thanks in advance!    [IMAGE][IMAGE]
Using an External GPU on an Alienware M9700