urgent help needed pleaseeee

hi all.
this is my first post, so hopefully i can get help from all of you. =)

i have a linux box(debian) current using ati 9800. and i'm thinking of replacing this card with nvidia 5200. so can i just replace the card?? and will the linux box still running fine???
or i have to do something to it? like reinstalling a new driver???
please give me instruction on how to install graphic card driver please. i'm completely new the linux. =(

***linux running in console only no GUI or xwindows.

regards

Just install the nVidia driver, which you'll find is really easy to install compared to ATI's convoluted drivers that don't work properly on Linux.