AMD can't compete with Intel in the field of raw performance in general, but it gets interesting when you look at some specific price ranges or product types. You can find AMD chips in some laptops offering decent CPU and good GPU performance. There are also affordable mini-ITX boards for AMD APUs that can compete with Intel Bay Trail boards.
How does AMD based computer (a EliteBook 725 G2 laptop in this case) performs on modern Linux distribution? What is the difference between open
radeon and close-source
fglrx graphics driver? Is the user experience as good as with Intel or Intel+nVidia based laptops?