New Desktop. Why get a graphics card?

If the intended use is just for surfing the web, email, word processing, etc... then a computer with built-in video is all that is needed. If you think you may want to do gaming in the future you could add a dedicated graphics card then, provided the rest of the computer is up to it. If you check the mfr specs you'll see that there are PCIE slots available for a dedicated graphics card to be added.

Just to ADD a little to the above you should also make sure you know the wattage of the power supply, more importantly the voltage on the +12 rail(s) and also if it has preferably a 6 pin power cable. I say preferably since most dedicated cards that require one come with a dual Molex to 6 pin adapter but having a dedicated one is much better.

You can probably ask the sales person but my bet is he won't know and you would have to contact the manufactuer.
Since the only other way is to open the case and in all most every case (no pun intended) this means you would void the warranty.
Fabe

I don't think you void the warranty of a manufactured computer by opening the computer case. You can install more RAM and such without voiding the warranty.

A dedicated graphics card is not needed if you don't game.

thefabe said:

... Since the only other way is to open the case and in all most every case (no pun intended) this means you would void the warranty.
Fabe

I have only ever seen 1 brand of computer that the warranty was voided if you opened the case. It was some eMachines computers I saw at Best Buy a few years ago that actually had a seal applied that indicated that the warranty would be voided if the seal was broken. That is reason enough for me to never consider buying one of those. I can see that on a laptop, for instance, but not for a desktop.