If
this is your desktop, I have the same one. I ended up installing
this card and upgrading my power supply from the 400 start to
this one and installed
2 fans since the only included fan was the one attached to my cpu =_=
Anyway, with what I've done so far, I'm able to play the current WoW on Ultra settings with an average of 90fps. Works well while raiding and going to high-ish pop areas on the game. I've also run Diablo, Sims 2 and Sims 3 fairly well.
BUT if you don't want to get one like I got, go to the ASUS link for the desktop and look at the specs, you can see a list of Graphics Card options. Just remember to look at the specs for the one you like... check to see what the the required/recommended power supply is because I can almost guarantee you will have to replace yours as well... I'm happy with mine so far with what I added. I'll be looking into possibly installing a couple more fans if spaces are available to plug them in and there's room... I hope I was of some help =]
P.S. Lots of links, srry >.< kinda hard to see them lol