Your and my PC will vary. The consoles don't. They can optimize the game for that particular console. As for a PC they would have to optimize it for each and every system out there, AMD, INTE, or Intel with Nvidia Graphics, Intel with AMD graphics, AMD with Nvidia Graphics, AMD with AMD graphics, and add in OS's and so forth and so forth.... You understand companys dont want the headache of making a engine for each of your systems so they have to comprimise on the code, its not impossible, but it takes lots of time and effort...Hence the console, 1 console, 1 optimized code, they can base that engine with refinements over the consoles lifetime... Get it? Now get out!