I'm really bad with hardware-related things, so I thought I'd ask you guys....

Are (in general) laptop graphics cards interchangeable? I have an nvidia GeForce 9200M GE and it's decent, but not good enough for running my beloved large battles on ETW. I've been thinking of getting a new one but is that even possible? Or is the graphics card incompatibe with my computer?

by the way my computer is an HP G70T series, and i got it in January so it's pretty recent.