I just thought I'd share these tips in one place in case anyone else is in the pursuit of keeping your Mac cool. I don't think I've seen one of these suggestions too many times. I have a 2011 15" MBP, so hopefully you can understand my quest for lower temps and hopefully an extended MBP life. I've tried everything from drilling holes in the bottom cover to all kinds of external cooling solutions like cooling stands and the like. Nothing seemed to make more than a 1-2 Celsius difference. The MOST effective ways of keeping my MBP cool have been a combination of. SMC Fan Control - I use SMC to keep my minimum fan speeds at 3,000 at all times. This is almost inaudlble unless the room is absolutely silent. I could set them to run at 6,000rpm all the time but I value my sanity. Turbo Boost Switcher - Using this App to disable turbo boost makes the single most BIGGEST difference in temps. In most usage situations, turbo boost is completely unnecessary. I'll occasinally re-enable turbo boost if I need to render something in a hurry. You can use Intel Power Gadget in combination with TBS if you want to see TBS at work. GFX Card Status - This app allows you to manually select which GPU you are using which can also help quite a bit in controlling temps. One drawback with this is that you can only power an external monitor with your DGPU.