I just browsed through: http://forums.macrumors.com/showthread.php?t=1109471 Well, I recently bought the high end 15" macbook pro. I had to reformat the disc and reinstall the operating system due to some problems I run into. Before I reformated, my fans never run at full speed and the temperature was definitely never hot to the touch if under heavy load. So, when I reinstalled the OS, i had firefox open (the page was google.com) when I clicked on photobooth... after 5secs or so (no more than 10 secs) the fans started running at full speed(very loud), the machine was extremely hot to the touch.. not to mention the bottom part of the laptop. Another instance was when I had: terminal, firefox (no flash was playing) and skype (video call) .... I had the machine on my lap, my machine started gradually to turn so hot in a matter of minutes (2 or 3 minutes tops) .... it actually burnt my skin (patches of redness)...... all these is very strange, because I don't recall running into temperature problems or fan problems running the exact applications before I reinstalled mac os. Which makes me to think that it might have something to do with the efi update 2.1 that was rolled out earlier. By that I mean, after I had a clean install of the OS .. i didn't receive the efi firmware update ... or any firmware update .... all other updates were installed. Should I download the efi update 2.1 from the apples website? Any thoughts? Update: It appears that if I do the same as above aka have firefox. photobooth or even facetime running at the same time, with "automatic graphics switching" disabled, the temperature doesnt get as high as before .. i need to do more testing though.