rMBP at 99 Degrees! Is this Normal???

Discussion in 'MacBook Pro' started by renosausage, Apr 19, 2013.

  1. renosausage macrumors regular

    Sep 22, 2012
    Hey everyone,

    My 15" rMBP will often hit a temperature of 94 to 98 degrees while playing COD or StarCraft.

    It will even reach that temperature while running 3D Imaging Anatomy Programs.

    I have never had it shut down because of the heat, but I just wanted to know if this was normal or should I call Apple about this issue and try to set up a repair.

    I use the Temperature Gauge App to record my temperatures. It also warns me when the temperature gets above 90 degrees.

    Heres a Picture:


    It is not currently running hot, but if you look to the right of the green bar on CPU 1 CORE you will see a gray line that indicates hoe high the temperature had been recently.

    That particular temperature was 99 degrees.
  2. GGJstudios macrumors Westmere


    May 16, 2008
    That is completely normal. The Intel processors used in Macs are designed to automatically shut down to prevent damage if they truly overheat. CPU Tjmax = 105C (221F), GPU Tjmax = 100C (212F) on i3, i5, i7 processors. (Source: Intel)

    Unless there is a rare defect in a Mac, most temps are well within the normal operating range, considering the workload being put on it. Websites with Flash content, games and other multimedia apps will put higher demand on the CPU/GPU, generating more heat. This is normal. If you're constantly putting high demands on your system, such as gaming or other multimedia tasks, expect temps to rise and fans to spin up accordingly. It's just your Mac doing its job to maintain temps within the normal range.

    It is also quite normal for your Mac to become extremely hot to the touch during intensive operations. The aluminum body transfers heat more effectively than other materials used in computer casings, so you will feel the heat more. This doesn't indicate that it's overheating and will not harm the computer to be hot to the touch.

    Your fans are always on when your Mac is on, spinning at a minimum of 2000 rpm (for MBPs) or 1800 rpm (for MBAs, MBs and minis). iMacs have 3 fans with minimum speeds in the 800-1200 range. They will spin faster as needed to keep temps at a safe level.

    If your fans are spinning up without increased heat, try resetting the SMC.
    (PRAM/NVRAM has nothing to do with these issues, so resetting it will not help.)

    The intake and exhaust vents are in the back of the computer near the hinge on all Mac notebooks (except the new MBP with retina display, which has intake vents along the sides at the bottom). The iMac vent is a slot on the back near the top of the computer. Make sure the vents remain unblocked to allow your computer to perform at its best.

    Learn about the fans in your Mac
    Apple Portables: Operating temperature

    For Flash-related issues:
  3. renosausage thread starter macrumors regular

    Sep 22, 2012

    I just ran a hardware test. An error showed up and I was given instructions to call Apple immediately.
  4. GGJstudios macrumors Westmere


    May 16, 2008
    You may have a hardware problem, but those temps are still normal, considering the workload you're putting on your system. Let Apple check out your system.
  5. Ricanlegend macrumors 6502a

    Apr 21, 2009
    What did they say ?
  6. locoboi187 macrumors 6502a

    Oct 3, 2012
    Sometimes I get those errors during diagnostic tests when i DON'T have my power adapter plug in, and searching up the error code will tell me that.
  7. renosausage thread starter macrumors regular

    Sep 22, 2012
    Thats what the code was, so I guess there is nothing wrong. I just didnt have the power cord plugged in.
  8. cosmicjoke macrumors 6502

    Oct 3, 2011
    Portland, OR
    mine is no different, i'd honestly have preferred the 2.4ghz over the 2.7ghz for lower temps but the 2.7ghz was the only way to get the ram without custom ordering it... apple care and don't worry until there is actually a problem is my philosophy on the matter.
  9. jafingi macrumors 65816


    Apr 3, 2009
    Normal temperatures under that heavy load. Your Mac will automatically shut down if the temp gets too high.
  10. Doward macrumors 6502a

    Feb 21, 2013
    Apple applies too much heatsink grease at the factory, with sub-par machining on the heatsinks. That's the problem.
  11. luffytubby macrumors 6502a


    Jan 22, 2008
    how do you know this?
  12. Doward macrumors 6502a

    Feb 21, 2013
    Combination of first hand experience and collaboration with other folks on the internet.
  13. swerve147 macrumors 6502a

    Jan 12, 2013
    Has anyone tried lapping the heatsinks on these things? Or is it not possible?

    I would re-paste but I'd like to keep my warranty. Maybe after the warranty has expired.
  14. Queen6 macrumors 604


    Dec 11, 2008
    Land of the Unexpected
    No this is normal behaviour same as my 15" Retina. If you are concerned about temperature and want to reduce it elevation of the rear of the machine helps, as sitting flat on the desk only reflects the heat back to the base of the Mac. You can buy passive aluminium coolers like Rain Designs Mstand or iLap. Most powered coolers are designed for PC notebooks and don't work overly well with Mac`s if at all. One cooler that does work efficiently is the Moshi Zefyr 2, as it`s principle of cooling is specifically designed for Apple portables, by blowing the air horizontally across the base of the computer, however don't expect miracles.

    Link: Moshi Zefyr 2
    A cheap USB fan can achieve the same if strategically placed, not as elegant mind, nor as easy to put in your notebooks case :p but they do help to reduce case temperatures.

    You can use software to override Apple`s own cooling algorithm by manually taking control of fan RPM and setting up power profile presets with SMC Fan Control 2.4, or here with UltraFan which allows you stipulate a preset temperature and the software will automatically raise and lower fan RPM`s to keep the system at the predefined temp, which i personally feel is a far more elegant solution. At the end of the day you want to control your system temperature, not your fan rpm`s. For me SMC is now pretty much redundant with the latest release of UltraFan having manual control of the fans RPM, and subsequently i am starting to uninstall it from my own Mac`s. SMC FC is a great app, however although it`s recently updated, functionality is limited compared to some newer apps, equally SMC Fan Control is rock steady stable and a finished product.

    Strictly speaking Apple`s own cooling algorithm works, albeit at sacrifice of increased temps for quieter operation. This has always been the Apple way and is really nothing detrimental to the system, i have one MBP from 2008 all original barring a recent fan change that has an uptime of over 30K hours. The latest MBP`s need less assistance in remaining cool; for some it`s simply disconcerting the heat generated and transferred to the case, although it`s perfectly normal as the aluminium acts as a heat-sync. i have to deal with elevated ambient temperature so at times a software solution is useful. Apart from the passive cooling the Mstands bring they also offer a very sound ergonomic solution. A passive cooler and UltraFan will maximise the cooling, there is little else you can do short of reducing the ambient temperature or the system load. If I know i am going to push a system i will close all apps that are not essential as this can and does make an impact to system temperature.

    High temperatures in general is not overly harmful to your systems, unless you push to the extremes. What is far more detrimental is thermal stress, where temperatures rapidly cycle by significant margins over a short period of time. Anyone striving for great longevity should look to minimise rapid temperature changes, here UltraFan is your best friend.

    Using a RainDesign Mstand, a Moshi Zefyr 2 and latest version of UltraFan I can reduce temperature by over 20C when transcoding an MKV video file, and that is something worth thinking about;

    • Apple default cooling algorithm 99C - 103C (still on Mstand) fans 4K and escalating :eek:
    • Mstand, Zefyr & UltraFan 79C - 82C fans at 5.8K :cool:

    Recently i have been experimenting with a CoolerMaster Notrepal E1 cooling pad, it has a single very large fan 23CM (9") running at 800 rpm, and most importantly moving a significant 91.25 CFM, this is far more than most other powered coolers i have tried.

    The fan by far takes up the majority of the coolers body, runs slow and quiet. As it`s designed for a PC portable i didn't have any high expectations; the cooler runs quiet as in silent, perfect size for a 15" MBP, has USB expansion, single speed with on/off button and lifts the machine a good couple of inch`s of the desk. I chose my Late 2011 2.4 i7 15" MBP, it`s connected to an external display, runs 24/7 and is generally north of 70C (158F) on any given day. Any software solution only results in the MBP doing a fair impression of a "Turbojet" which we all love to loath, as workloads rise and temperatures increase.

    The important part cooling; well as ever with a Mac a mixed bag, the elevation definitely helps versus being flat on the desk. I have little expectation of any cooler reducing a Mac`s internal temperature significantly, what the Notepal E1 was able to do was systematically reduce fan rpm by a good 1K without any increase in internal temperatures, which is a big step forward. With this cooler and a software solution (UltraFan/SMC Fan Control) it`s possible to have a moderate load and a relatively quiet system, and that counts for a lot. The major downside to the Notepal E1 is the size, it`s clearly designed to be "planted" on the desk. when using the 10 degree angle i use a piece of that rubber you can buy for car dashboards, just to ensure the MBP doesn't slip and slide about, just seems prudent with such an expensive notebook perched on the edge of the desk. The Notepal E1 also unusually blows a stream of cool air out of the front to cool the hands which is well unusual, nevertheless not unpleasant on a hot day.

    I still rate the Moshi Zefyr 2 as the best powered cooler for a Mac portable simply due to it`s continuous horizontal air flow, however the pricing and availability make it a tough choice. 1K reduction in fan speed may not sound that big a deal, however if that keeps the Mac below the "Turbojet' threshold then it`s a worthwhile investment for anyone seeking the quieter life :p

    What i have observed over the years is the best solution for a Mac portable is a combination of software, and powered cooler, on my Late 2011 15" MBP (2.4 i7) running both internal & external display`s i run; Ultrafan set to 66C, AdBlock and it sits on a CoolerMaster NotePal E1 this results in a reasonably cool and quiet system. My Retina is better behaved thermally and i just run UltraFan, AdBlock and it sits on a Rain Design Mstand.

    Note: the CoolerMaster Notepal E1 moves a very considerable volume of air, over 90 cubic feet per minute (CFM) a regular PC cooler moving say 40CFM will have little to no effect on an Apple portable, my recent observations are undertaken in an ambient temperature of 25C to 28C, so you may not need to go all the way to achieve a cool, quiet Mac

    The old adage still applies; it`s easier to keep a system cool, than cool-down an already hot machine. This being said it`s not strictly necessary, equally it`s nice to know that there are options for reducing temperature out there.
  15. Doward macrumors 6502a

    Feb 21, 2013
    Yes, that's exactly what I did. I'm uploading the complete 40 minute video to youtube now, and I'll post it on here.

    While I have no doubt that many will still claim 'it's just normal the computer will shut down if it gets too hot', hopefully some light will be shed upon the matter.
  16. TC400 macrumors 6502a


    Apr 20, 2010
    Pittsburgh, Pennsylvania
    Is it idling at 99 degrees? My iMac does that. My 15 inch rMBP is at 124 degrees just running safari and Mail and sitting on my lap

    **nvm it shows as Celsius.**
  17. Doward macrumors 6502a

    Feb 21, 2013
    LOL 99F and 99C are totally different.

    I'm surfing the web @ 33C right now.

    Oh, here's the link to the YouTube video detailing the thermal issues in the Macbook Pro lineup:

    (this link is for 9m26s in - skips the initial disassembly process)

  18. TC400 macrumors 6502a


    Apr 20, 2010
    Pittsburgh, Pennsylvania
    I know that. But I didn't see that until after I posted.

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