My Macbooks fans start flaring up pretty significantly at about 10% CPU load. For example, the CSS animation http://www.reddit.com/r/XboxOne will cause my fans to get noticeably. Sometimes a single YouTube video will get them going. So loud that I can't hear a video with 3 volume increments. I've got the 2014 15" 2.5GHz, 16GB RAM, 500GB SSD, Nvidia GT 650m Macbook Pro Retina. Its only about 2-3 months old and its been doing it since I got it. My old 2011 MBP was dead silent. This Retina MBP was a lot worse until I turned off automatic graphics switching. It managed to bring temps down a bit since it lightened to load on the CPU by letting the GPU handle graphics exclusively. Chrome is my default browser (No, I don't want to switch to Safari). I've tried an SMC reset, but I'm not entirely sure I did it right so maybe someone could walk me through ti for this specific laptop.