Hello to you  I have the same system as you, with gtx660m card, and it's been almost one year since I regularly try to install OSX, but in vain.  Have you ever succeeded, and if so how solution.   For now I'm trying with this record:  https://osxlatitude.com/index.php?/topic/6182-asus-g75vw/?hl=+asus + G75VW   by changing the parameters of the video card ...   I hope ...