video card: version 1.1 or 2.0 compliant ?4x/8x?

I need to upgrade my video card (have a PCI card and want AGP- i know PCI-express succeed AGP). How do i know if i have a version 1.1 or 2.0 compliant system? Would either a 2x/4x card or 4x/8x card work or only one of them? Sorry for the confusion. If I know my [...] http://bit.ly/j3lYy2