Something weird is going on, my friend. I have been using a 2012 rMBP 15" w/only 8GB of RAM (ordered the day they were announced before we found out the RAM was

Something weird is going on, my friend. I have been using a 2012 rMBP 15" w/only 8GB of RAM (ordered the day they were announced before we found out the RAM was not upgradeable, whoops) every day, 10 hours+ a day and never have any problems. The only time my fans kick on is when you'd expect; when I'm doing heavy load tasks like playing a game or doing anything using Adobe Flash. I can stream HTML5 video full screen for hours and the fans never become audible. I can run Xcode for hours and as long as my app isn't being a CPU hog, everything's kosher. So, something is wrong with your machine. The OS X reinstall failing to resolve the issue points away from malware, and towards an environmental or hardware issue. If your machine is only a few months old Apple will take a look at it for free, I'd consider that option to rule out any hardware issues if you can't think of any obvious environmental causes (Do you smoke? High temperature in your working area(s)? etc.)