Will this video card work in my computer?

I have a Dell Dimension E521 and I am interested in getting a ATi Radeon X550XT PCI-Express 26x card Video Card for my desk top (for example, click here... http://www.geeks.com/details.asp?invtid=VX550XT-128P&cat=VCD) Does anyone know if this video card will fit into my computer? Also, does anyone know how good the quality of this card is? Thank you.|||Yes, this card will fit in your computer, it is only a good to average card however and won't blow you away with its quality.