@shargath check out this thread (
http://www.tonymacx86.com/mountain-lion-desktop-support/61216-10-8-how-enable-hd4000.html ) because you might find, like me, that the graphics enabler won't enable HD4000 graphics. Your system might work, like mine did, but without HD4000 you will have problems with video playback in apps like VLC and Adobe Flash. HD4000 should also improve boot time. Have a look at my post to see which option I used, but keep in mind that your processor is different to mine. Of course, try both graphics enabler yes and no first, you can check for HD4000 function in 'about this mac-more info-system report-graphics/display' if it doesn't say HD4000 then it is not enabled. Good luck.