Will a PCI Express 2.0 video card work for a PCI Express x16 slot?

I am looking at the Dell Studio Desktop in this link. a href="http://www.dell.com/content/products/features.aspx/desktops_great_deals?c=us&cs=19&l=en&s=dhs" rel="nofollow"http://www.dell.com/content/products/fea…/a it is the one that is 799. I was wondering if a PCI Express 2.0 video card would work on this desktop