10 Replies Latest reply: Feb 9, 2013 9:06 AM by SwankPeRFection
Iamawesome997 Level 1 Level 1 (0 points)

I bought a new MacBook Pro 2012 (non-retina model) a in November last year.

Since then, I installed 16 GB of RAM over the pre-installed 4 GB, and ripped out the hard drive in favor of an SSD.

Since upgrading the hardware components in my Mac, my Mac had never felt really hot.

Until now.

Just yesterday, I felt my Mac getting really hot on my lap.

I thought it was due to the fact that I was installing Parallels Desktop 8 that caused it to heat up.

Today, I felt that my Mac was heating up again, even though I don't have any VMs installed (yet).

Is this a problem due to Parallels?


MacBook Pro, OS X Mountain Lion (10.8.2)
  • 1. Re: Why does my MacBook Pro (Non-retina) 2012 get really hot?
    CMCSK Level 6 Level 6 (10,425 points)

    Just yesterday, I felt my Mac getting really hot on my lap.

    From MacBook Pro: Care, Use, and Safety Information

    For prolonged use, place your MacBook Pro on a flat, stable surface. Do not place your MacBook Pro on your lap or other body surface for extended periods of time. Prolonged body contact can cause discomfort and potentially a burn.



    Macbook Pro is a "notebook."  It is not a laptop and should never be used as one.



    If you are concerned about the heat, you are still under warranty.  Call Apple Care and get a case #.  Take full advantage of your warranty before it runs out and consider purchasing the Apple Care Protection warranty for an extra 2 years.









  • 2. Re: Why does my MacBook Pro (Non-retina) 2012 get really hot?
    Iamawesome997 Level 1 Level 1 (0 points)

    Hi CMCSK,

    I did what you suggested, and placed my Mac on a table instead of on my lap.

    It still felt really hot.

    I have a widget called iStat Pro, and it said my memory modules were running at 60+ degress celsius.

    I swapped them out for RAM mdules I used before, but after using it for a while, it still reported 60+ temperatures.

    I made sure that air could flow in and out of the Mac easily.

    iStat Pro also reports fan speeds up to 5000+ RPM.

    Has anyone experienced this?

  • 3. Re: Why does my MacBook Pro (Non-retina) 2012 get really hot?
    virzintas Level 1 Level 1 (0 points)

    Hello, the same is with my macbook retina. Can't handle this problem. When i'm watching videos through the internet temperature rises until 90 degree celsius and fan speed is about 4000-5000rpm. Don't know what to do, i reset smc but still the same, can't even play games cause the temperature rises above 100 degree celsius. Maybe I need to take my mac to apple service?


    And the other problem is that the pixel on the screen burned, second time this year and the screen has been changed. What to do?

  • 4. Re: Why does my MacBook Pro (Non-retina) 2012 get really hot?
    SwankPeRFection Level 4 Level 4 (1,435 points)

    MacBooks get hot when doing anything other than basic work.  (browsing, word editing, etc.)  Multimedia intensive tasks will heat it up some, but even video playback (like YouTube) will heat it up a bit, but not a ton.


    You might need to run ActivitMonitor from your Utilities and see what's killing your CPU time.  Something has to be running and pegging your CPU in order for this to happen.  Make sure you pick All Processes and see what's taking a ton of CPU usage.  That process will be the one that's causing this.

  • 5. Re: Why does my MacBook Pro (Non-retina) 2012 get really hot?
    virzintas Level 1 Level 1 (0 points)

    I ran activity monitor, but there weren't any process taht was eating cpu. Only safari. I study art and technology so i need to work with premiere and illustrator alot, and i cant because of the heating problem, cant even type something if i need cause the keyboard is f*cking hot.

  • 6. Re: Why does my MacBook Pro (Non-retina) 2012 get really hot?
    SwankPeRFection Level 4 Level 4 (1,435 points)

    That's weird.  It shouldn't be constantly hot like that unless the fans/heatsinks aren't doing thier job.  Do you have a keyboard cover on it or anything?  Sometimes those will cause excessive heating because extra air cannot be siphoned in through the keyboard grid.  Also, sometimes a SMC/PRAM reset will fix any weird fan control issues if there are any that is causing this.


    As a side note, you've been inside the system before.  I'd take the cover off and then make sure the fans are clean and blown out/free of dust along with the heatsinks.  Also, make sure they come on (be careful when you turn the system on with the cover off).  Open the clamshell and set it on its side like an open book so that it has a solid rest and you don't run the risk of shorting the inside components out.  Turn it on enough to make sure the fans, etc. work.  If the fan(s) don't work, then that's the source of your heat problem.

  • 7. Re: Why does my MacBook Pro (Non-retina) 2012 get really hot?
    ShaneBunting Level 1 Level 1 (20 points)

    MacBook Pro's have a reputation of heating up, that's original, unibody and retina editions!


    I don't think the changes you made to the RAM and SSD make a difference here, if they weren't done proper the Mac wouldn't start up etc..


    Paralells would be pretty intense, even on that powerful processor, so the MBP is working hard and breaking a sweat. The vents may be getting covered without you noticing, try making sure it's clear on a flat wood surface and see if the problem still exists. If so, take it to Apple and they will run some tests that only they can which will test your fans and overall cooling system.


    Another idea would be to download a Mac app called smcFanControl and turn up the RPM of your MBP, making the fans work harder and showing you a temperature based on your Macs internal sensors. Very cool and effective. If you're like me, you'll love hearing the power of the MBP at 6000 rpm!


    Good luck and hope I helped!

  • 8. Re: Why does my MacBook Pro (Non-retina) 2012 get really hot?
    Bob Allison Level 4 Level 4 (2,315 points)

    I do not mean to imply any lack on your part; but would feel remiss if I did not mention ...


    Who opened the case and installed the SSD?

    Are you absolutely sure all the heat sinks and heat shields were replace exactly as before, disturbed thermal compound was replaced with new, and that all wires and Kapton tapes were (re)placed exactly as before?  I burned up a chip once by not replacing One Dab of thermal compound with new.  (I was an idiot.)


    Other than that – they do run hot.

    I actually got a 'sunburn' on my thigh one day when wearing shorts.

  • 9. Re: Why does my MacBook Pro (Non-retina) 2012 get really hot?
    clintonfrombirmingham Level 7 Level 7 (28,665 points)

    I just recently (Wednesday) upgraded from Win XP Pro to Win 7 Pro running under Parallels 8. It amazed me at how simple the upgrade was (with some terrific support from the Parallels support staff) and I'm very surprised, now, at how cool my computer is running Win 7 instead of XP. I don't think, therefore, that the problem has to do with Parallels - I think what you're experiencing is just, well, the normal heat that the MBP generates.


    I don't recommend using any 'fan control' software at all - you're banking on being more knowledgeable that Apple engineers. If you are worried about heat and fan issues, I would definitely use a diagnostic tool such as iStat Menus 4 - it's well worth the $16 or so...


    In short, I wouldn't worry too much - if things get out of hand you can first try resetting the SMC and, if you still feel that it's overheating, take the machine to an Apple Store. Again, I don't recommend trying to adjust the fans yourself - but I do recommend monitoring your heat and fans with iStat Menus 4.


    Good luck,



  • 10. Re: Why does my MacBook Pro (Non-retina) 2012 get really hot?
    SwankPeRFection Level 4 Level 4 (1,435 points)

    No heatsinks get disturbed when replacing memory or a hard drive.  Come on man.


    As for Paralles being the issue.  I run Parallels and Windows 7 Ultimate for hours every day and hold the system on my lap with no issues.  Just last night I was watching videos and the only part that heated up slightly was on the left bottom side where the proc is.  These things don't go nuts on heat unless you're really pushing them for some reason.  Games, graphic/cpu intensive apps will do it, or a screwed up process that's locking the CPU at max or 50% (due to multicore/hyperthreading) and causing it to heat up like that.


    Something's not right.  I'd go back and ask your self when this all started for sure.  If it really was when you just did the SSD, figure out what you did then.  Was it the hardware replacement or was it the OS reinstall.  It's possible that even something as minior as a driver misbehaving could cause this, although that doesn't really happen unless it's a graphics or cpu driver that doesn't load properly.  Unfortunately, on a Mac, it's hard to tell if that's the case.  A prime example of this is the XP issue Clinton talked about.  His PC was most likely heating up more because of the way XP can't properly handle the multi-core CPUs in the newer systems.  The drivers aren't geared towards modulating that processor at idel properly, so it actually pegs the proc to a higher utilization than necessary.  It's like when you bootcamp a mac or on a PC when you interrupt the bootup before Windows starts and you let it sit there.  The DOS portion of the OS doesn't handle the CPU as a multi-core clockable one.  To it, it's a single core single speed proc that's pegged at 100% all the time, so it heats up.  It's a crude example, but it's what happens.  This is why it's very common to see fans kick in full blast when BIOSs are updated on PC based laptops, because if the CPU overheats and shuts down during the flash, it's bye bye motherboard.  It's a precaution...