Your graphics card is faulty so you need to change it, but you want to know if it can stay?
I'm not sure if I understand you correctly.
If your concern is only in connection with the RAM upgrade, this doesn't affect the graphics card.
I'm not a graphics expert, but I know that you can insert an NVIDIA GT 8600M and surely some other models. But you can as well insert another x700. The main task will be to find a replacement card.
I'd suggest to PM
An-Dr.Zej. He's not very active in the English forums, but has substantiated knowledge about graphics cards and is our M-series specialist in the German forums.