So I replaced my internal drive with a 1tb Samsung SSD. And of course had the fans go nuts. I have it resolved using Mac Fan Control, but wanted to know ideal settings. By default, it's definitely more aggressive than stock (as my fans are in the good 1100rpm range now). I have to change each fan manually (oddly enough the HDD fan doesn't go nuts if left on Auto, just the Optical drive and CPU). So, What's a good temp range for the three fans to go off of? Sidetrack: Did I mention that iMacs SUCK to take apart? Why the hell didn't they make it so you can get in them from the back!?