I have an old Alien laptop gamer where the the ATi video graphics card has died. I want to use this old machine to game on old video games. The stats are for the Alien: Alienware area 51-M Model #766SN3. The video graphics card: ATI Mobility Radeon 9700 Pro w/128MB module. PLease advise if this graphics card is still available and what possible substitutes will work with this old laptop. Thank you in advance for your advice.