Apple Says 2018 MacBook Pro Throttling is a Bug, Fix Available Now in New macOS Update

Discussion in ' News Discussion' started by MacRumors, Jul 24, 2018.

  1. MacRumors macrumors bot


    Apr 12, 2001

    Apple this morning released a new supplemental update to macOS High Sierra 10.13.6, which is designed to address a bug that caused the new eighth-generation quad-core and 6-core Intel processors in the 2018 MacBook Pro models to throttle inappropriately.

    The new macOS High Sierra update can be downloaded through the Software Update function in the Mac App Store on all 2018 MacBook Pro models. Today's supplemental update (build number 17G2208) is limited to those machines and is not available for other Macs. A direct link to download the update is also available.


    According to Apple, the throttling seen in the higher-end 2018 MacBook Pro with Core i9 chip and other 2018 MacBook Pro models is unintentional.

    The throttling issue first came to light on July 17, a few days after the first new 2018 MacBook Pros began shipping out to customers. YouTuber Dave Lee tested the top-of-the-line 2018 15-inch MacBook Pro with 2.9GHz Core i9 chip using Adobe's Premiere Pro and found that it was underperforming compared to a 2017 MacBook Pro with a Core i7 chip.

    Multiple other tests followed from customers and media sites that obtained one of the Core i9 machines, and many came to the same conclusion, that there was an unusual amount of throttling that was impacting the machine's performance. It was not entirely clear if other 2018 MacBook Pro models were throttling unintentionally, but Apple's patch today suggests that was the case.

    While there were many theories as to what was causing the throttling, Apple has discovered that there was a missing digital key in the firmware that impacted the thermal management system, driving down clock speeds under heavy thermal loads. This is what has been addressed in today's update.

    Apple has apologized to customers who have experienced less than optimal performance on their new 2018 machines.

    Following today's update, customers who own a 2018 MacBook Pro should see an appropriate level of throttling that is common to all devices under heavy load and does not impact performance to the point where the machine is underperforming compared to earlier, less powerful models.

    Apple says that customers can expect the new 15-inch MacBook Pro to be up to 70 percent faster and the new 13-inch MacBook Pro to be up to 2X faster than 2017 models, as outlined in the performance results on the company's website.

    Article Link: Apple Says 2018 MacBook Pro Throttling is a Bug, Fix Available Now in New macOS Update
  2. Baymowe335, Jul 24, 2018
    Last edited: Jul 24, 2018

    Baymowe335 macrumors 601

    Oct 6, 2017
    Let’s wait for the armchair engineers here to say this isn’t good enough and doesn’t address the hardware issue they concluded must exist.

    See how far overreacting gets you?
  3. djcerla macrumors 68000


    Apr 23, 2015
    Fake news. MR forum all agrees thinness is the culprit,

  4. WestonHarvey1 macrumors 68020

    Jan 9, 2007
  5. geoff5093 macrumors 68020


    Sep 16, 2014
    Dover, NH
    I'll wait and see how benchmarks and real world tests compare before and after. People were saying temps were reaching extremely high levels when the throttling kicked in, so it didn't appear to be a "bug", rather inadequate cooling design.
  6. MyMacintosh macrumors 6502


    Aug 10, 2012
    Knowing apple's recent track record, I'd still wait and see.
  7. tubeexperience macrumors 68040

    Feb 17, 2016
    How about making the laptop thicker and with a better cooling system?
  8. ondert macrumors 6502


    Aug 11, 2017
    That fast? I have just finished reading the previous new.
  9. skinned66 macrumors 65816


    Feb 11, 2011
    Ottawa, Canada
    Well at least the fix was very timely so I think credit to Apple is due.
  10. Scary Spice macrumors 6502

    Scary Spice

    Jul 31, 2015
    British Columbia
    Still an INSTA-BUY for me as soon as B&H gets some stock, doggie.
  11. The Mercurian macrumors 68000

    Mar 17, 2012
    Right folks let’s see some before and after fix cinebench scores :)
  12. goobot macrumors 603


    Jun 26, 2009
    long island NY
    Let’s see if this actually has any effect first.
  13. aceys macrumors member

    Oct 25, 2012
    From their explanation, it sounded like the a key file was missing. Perhaps signing/including keys for their firmware is a step that's a step they bypass during internal testing, or perhaps they resign before creating the final firmware distribution and there was an issue, or something. I would bet money this firmware was working properly internally.
  14. Dydegu macrumors 6502a


    Mar 9, 2015
    Oh, well at least we all remained calm and no one freaked out.
  15. deannnnn macrumors 68020


    Jun 4, 2007
    New York City & South Florida
    Can't wait for the next round of YouTube videos.
  16. ericinboston macrumors 68000

    Jan 13, 2008
    If this is truly a bug, I applaud Apple for fixing it so fast.

    I'm sure we'll see some videos of testing the new MBs at full CPU speed for several hours to see if any thermal issues arise. I run about 40 different Mac and Windows machines at 100% CPU utilization 24x7x365 and have done so for years on end...and other than the machines getting hot (of course), they do not fail at all.
  17. MBX macrumors 68000

    Sep 14, 2006
    And nobody returned their 2018 MBP's, phew. lol
  18. cmChimera macrumors 68040


    Feb 12, 2010
  19. keysofanxiety macrumors G3


    Nov 23, 2011
    Look at the temperatures of these chips in comparative Alienware or MSI gaming laptops which are 4 inches thick. These chips run hot as hell the moment you put them under load. They're going to run hot when stressed no matter what you do unless you're using your laptop in a freezer. No amount of air cooling will keep them under 80C at peak.

    Plus the cooling on the tMBPs are much better than ones in those thick gaming laptops, honestly. If you take an MSI apart it's like looking into the first ever '90s laptop. They're just so lazy with space and thermal design. They throw more fans at it without any real appreciation how the heat will displace or flow.
  20. Dave245 macrumors 604


    Sep 15, 2013
    Yea but Mac Rumour members will still find a way to blame thinness and lightness, after all Apple isn’t committed to the Mac :rolleyes:
  21. chrono1081 macrumors 604


    Jan 26, 2008
    Isla Nublar

    Likely because it doesn't affect everyone. Testing is great and a very important part of the process but in reality you don't find a lot of things until it's in the hands of the public.
  22. timborama macrumors 6502a


    Oct 12, 2011
    I guess only Apple calls it a bug if they get caught. Otherwise, it's a feature.
  23. geoff5093 macrumors 68020


    Sep 16, 2014
    Dover, NH
    This goes along with my point though, how is this a "bug" and not just a fact that the CPUs run hot and the cooling isn't adequate for 100% load without throttling? Unless the "bug" Apple fixed was making them run even hotter before throttling.
  24. Trixxr macrumors newbie

    Oct 23, 2013
    Mine is scheduled to arrive tomorrow (end of day). I don't mind this bit of news the slightest!
  25. stevet macrumors 6502

    Apr 16, 2009
    It's possible the bug was with the temperature reporting, iow, wrong temps being reported.

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492 July 24, 2018