You are probably surrounded by more computers than you know what to do with, whether it's the phone in your pocket, the old clunker at home, or the sleek little ultraportable you got from work. And while they are more than enough for everyday tasks, when it comes to real graphics prowess, I'm talking about serious gaming, 3D design, or photo/video editing, most systems don't have the guts -- or the space to accommodate the kind of silicon you'd need to push pixels around.