Is there any way to access driver settings for a 680mx video card on our late-2012 iMacs? I am having issues while playing the Sims 3 similar to this video: http://www.youtube.com/watch?v=_duaN-H7Sr8 I want to attempt to fix the issues but can't seem to find a way to access the driver settings. Is this impossible with an iMac? If it's not impossible can someone please tell me what I'm missing? Thanks!