Hey guys! I'm planning on getting an iMac. Either 21.5 inch with the 750m, or the 27 inch retina with the r9 m290 (not m290x) I was wondering, how good is the r9 m290 in gaming? At 1080p or higher if possible. I currently have a gtx 550 ti. So: Is the gt 750m better or worse than the 550ti? Is the r9 m290 better or worse than the 550ti? And, do you have some fps for games for me?? Thanks!