Hello! I'm trying to play world of warcraft on my 2011 iMac 12,2 and apparently the game is using Intel's HD 3000 graphics? On power saver i don't have the option to switch it off and i can't find anything online.I called apple here in Portugal and they were clueless and put me on hold for 10 minutes i then quit the call... Now i used to play the game on this machine a few years ago no problem i think it's sierra that is enabling this HD graphics that i never even knew i had ? So what do i need to do to disable completely and make it so any game uses the Radeon card ? I hope i don't have to use lion? thanks!