There is a 56k modem inside and if you remove it you can put a new graphics card in.
The problem with your current graphics card is that fact that you have a 250 generic *crappy* PSU and the card needs atleast 300
oh i read somewhere it needs 90w, is this false?
and also what would be the consequence if i removed my modem? i have no idea what it looks like, but I have one seperate that has phone etc connected but im not sure if its the same