What temps is your iMac running? My system seems a little hot where the fans have to kick in every once in a while. Fans always kick in when playing a video, flash or no flash. Temperature will stay a little high, but the fans will be about 1700rpm. My system temperature just using the system (not playing games or video) is between 140 and 151, depending on what I'm doing. Currently, I'm at 147 with the fans at 1200rpm. I do have a lot of programs open at once, but they do not use much memory: twitter, mail, calendar, reminders, and two browsers. I did see before that Retina iMac's run hotter. But are these temperatures consistent or too high?