I am using Dell XPS studio 1640 laptop with ATI radeon mobile 3670 graphic card and now I want to upgrade it with P9800 or P9900 with ATI Mobile 4670 graphics card. I just want to know it ok if I but this. I want suggestion for that. Please reply me with some proper solution for that and it will be very helpful for me. if you have any idea than please reply me. I am waiting for your reply.