5 Replies Latest reply: Jan 28, 2013 8:04 AM by Courcoul
Quantum3 Level 1 (0 points)

Hi folks


I just found that the MBP 15" Late 2011 becomes hot and noisy after 30 minutes of using it with the Apple Cinema Display of 22" through the Mini Display Port (converted to HDMI -> DVI). I wasn't running any exhausting task, just surfing the web.


The constant temperature was 65 ºC, followed, of course, by the loud sound of the fan. When I unplugged the Apple Cinema Display, the computer cooled down to 45 ºC, and the fan stopped making noise.


Right now, I've plugged the Cinema Display again and I'm seeing that the CPU Temperature is rising its levels again (02:20 a.m.). CPUT is now at 56 ºC at (05:20 a.m.).


I'm puzzled here. So... why the MBP has had this problem and later it hasn't had it?


Thanks for your replies!



MacBook Pro, Mac OS X (10.7.4), 8 GB RAM ATI 7770 HD 1 GB DDR5
  • Courcoul Level 6 (12,970 points)

    When you plug in the Cinema, I'm pretty sure the Radeon discrete GPU will be called to service, and hence increase the heatload on the Mac. I know mine does when I plug in an HDMI display of far less resolution. Add the load on the CPU from any errant Flash or Java snippet in the web, and you have a toasty Mac. Since it is inevitable, you'll need to take steps that enhance its cooling capabilities, like getting some sort of laptop stand that permits better ventilation underneath.


    As for the sound of the fans, if it seems unusually loud or accompanied by screeching or any sort of scraping, they may be dusty and not working at full capacity. If you're adventurous and handy with tools, can try taking the bottom pan off and blowing the innards clean with a can of compressed air, concentrating on the fans. Else take it to the Store and complain of loud fan noise.


    For the adventurous, here's how to take apart and put back together: http://www.ifixit.com/Device/MacBook_Pro_15%22_Unibody_Late_2011

  • Quantum3 Level 1 (0 points)

    Hey! Thanks! That sounds quite logical. Btw, I just have the MBP on a table. Should I put it over another type of surface for better ventilation? If so, have an example? I'm pretty new to Mac, so I don't have any judgement here.


    Thanks a lot fr the reply!



  • Courcoul Level 6 (12,970 points)

    The measly few mm afforded by its tiny feet aren't enough to ensure sufficent airflow. There are a number of stands that give greater separation. Heck you can opt for some that even have fans in them to move yet more air, but I've never required that much. I have a pair of RoadTools CoolPads that have proven sufficent in even the most extreme cases. See here: http://eshop.macsales.com/item/Road%20Tools/RTCP


    In a pinch I've even used a pair of water bottle caps under the rear feet to lift up the arse end of the Mac and get the air movin'

  • Quantum3 Level 1 (0 points)

    I was thinking something like placing the MBP over those weighty bars of ice xD I was wondering because, if I play a video game under Bootcamp on the MBP, I think it will be fried. However, it seems that the Thunderbolt thing allows plugging external video cards. I'm just discovering what it does and it seems pretty nice!


    ¡¡¡Thanks a lot for your respones!!!

  • Courcoul Level 6 (12,970 points)

    BTW, if you want to see at all times what your graphics subsystem is up to, whether the integrated or the discrete GPU is up, try gfxCardStatus: http://gfx.io