Dell 2001fp Monitor...computer question

[chesTreasure]

So I'm just about to make the big buy and get the much talked-about Dell2001fp monitor (screen resolution - 1600X1200) so I can multitable without overlap, 'cause my screen resolution tops at 1268X1024 (or something like that) and I call Dell to make sure that the monitor is compatible with my computer - which is a Dell Dimension 2400 and the guy says that I won't be able to get the full resolution. So, I ask if I can get a video card, and he wasn't sure that would work, and that I probably need to get the Dell 4700 computer and even with that I would still need a video card.....so, any thoughts? Do I really need a new computer? Why can't a different video card just be installed into my present computer? Thanks.