2015 MBP runs warm

Discussion in 'MacBook Pro' started by Wonderstruck80, Jul 15, 2015.

  1. Wonderstruck80 macrumors newbie

    Jun 4, 2015
    Hello, brand new MBP here and am loving it. One minor gripe is that it runs warm to the touch on the bottom and am wondering if this is normal? Just have skype, safari with a few tabs and messages running.
  2. someoneoutthere macrumors regular

    Jul 27, 2014
    The Great Lakes State
    It is normal. You will also notice that your machine will run warmer/cooler depending on the ambient temperature.
  3. Wonderstruck80 thread starter macrumors newbie

    Jun 4, 2015
    Thanks, I think you're right. Seems to be running cooler at 11pm vs 4pm..
  4. maflynn Moderator


    Staff Member

    May 3, 2009
    Get an app like iStat Menus and smcFanControl. The first app will report what your actual temps are, and the second will allow you to manually increase the fan speeds to lower the temps.

    MBPs do tend to run rather warm, some people will say run hot, but either way those apps should help a bit.
  5. snaky69 macrumors 603

    Mar 14, 2008
    Aluminum conducts heat much, much, much better than plastics. FOr any given internal temperature, an aluminum laptop will always feel warmer to the touch than a plastic one, due to how heat transfer works. Aluminum "gives up" its heat more easily than plastic does.
  6. ckWTB macrumors member


    Aug 24, 2014
    Portland, OR
    Perfectly normal as explained by snaky69.

    Since the laptop enclosure is made of aluminum and acts as a large heat sink, it is normal for the enclose to become hot closest to the heat source. The 15-inch Retina MacBook Pro includes a single CPU/iGPU chip but may also include a separate dGPU chip. These processors are located below the back center edge of the keyboard. Two large cooling fans below the side edges of the keyboard connect to heat pips that transfer heat from the processors to the fans. That is the basic heat footprint and where you should expect the enclosure to feel the hottest. However, if you have the laptop plugged in to external power and it is charging your battery, or if you have a Thunderbolt connection with a large amount of data transfer then that can also generate a significant amount of heat near the cable connections. If you want to see the layout of laptop components then you can checkout iFixit://www.ifixit.com/Device/Mac_Laptop

    Something else to keep in mind is that there can be a significant amount of background activities occurring, which can contribute to increased temperatures, and this is especially true for a new computer. To track these activities you can run Apple Activity Monitor.

    For instance Apple Spotlight, Apple Diagnostic Reporting, Apple Time Machine, DropBox, other icloud storage systems can increase temperatures.

    If you want to look at component temperatures then HWSensors is free but does not provide fan speed control, while iStat Menus offers fan speed control and a free trial. Just keep in mind that temps jump all over the place so you can only get an accurate understanding of temperatures by using averages over a set period of time and equal conditions.

    Checkout Intel’s free Power Gadget application so that you can accurately monitor CPU temps, CPU power and CPU speeds with the data logging function. This is one of the best ways to see what is really going on because most real time monitors jump all over the place so it become impossible to get a good sense of temperatures and whether your machining is throttling. It is what I use for performance testing.

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