MacBook 16-inch Fan Noise

We are testing two new 16-inch MacBook's before doing a rollout across our organization. Under low loads (25% cpu utilization), fan noise will get annoyingly loud. We're not doing any GPU related and more routine work such as: using web applications, debugging web pages, Microsoft Teams conferencing (audio/video) with a handful of people, Photos downloading from iCloud, Mac Mail downloading a new mailbox from Exchange.


We DID NOT notice this on our 2015 MacBooks and this might prevent us from continuing the 16-inch MacBook rollout in our organization.


Interested to hear others experiences.


Tim

MacBook Pro 16", macOS 10.15

Posted on Nov 21, 2019 11:34 AM

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Question marked as Top-ranking reply

Posted on Dec 23, 2019 9:27 AM

All,


We are kind of wrapping up all our testing and working with the Apple Business Team to figure out how we move forward.


This thread is getting a little side tracked with monitors and so I wanted to point out that these issues discussed are completely unrelated to brand/model of monitors being used. That said, it IS related to having monitors connected and the internal GPU within the MacBook, along with the CPU and the overall heat that both generate.


In our final testings, we did clean installs with 10.15.2 and primarily tested an eGPU using a Razor Core and a Radeon RX Vega 64 so we could eliminate the internal GPU in the MBP.


It became really clear the combined heat from the internal Radeon Pro 5500m GPU and the i9-9880G CPU is too much for the current thermal management system, especially when using all USB-C ports. (I.e., for power, USB-C hub, USB-C to Display Port video cables).  From all the testing and heat generated by the unit, it looks like our Radeon Pro 5500m GPU is fried because we are seeing artifacts on text (laptop display and external monitors) but not when we use the eGPU.


Just so you understand our configuration with the eGPU:  We have one USB-C Hub connected to the MBP and one USB-C cable connected to the eGPU.  The one USB-C cable to the eGPU is powering the MBP but also the eGPU has the two Display Port cable to the monitors.  Now the MBP has two free USB-C ports.  This was producing about 38 degrees less heat in Airflow on the MBP.


When the eGPU is connected, we can push the MBP to about 60% CPU for sustained periods before hearing the fans at about 4500 RPM. But as many of us have noticed, when we don’t have an eGPU, we’re seeing this at 5% to 10% CPU.


We have installed Parallels and ran Windows 10 on three monitors on separate space and have done Geekbench tests and a variety of stress tests with the eGPU and its operating normally.  


Bottom line, the combination of using the GPU and CPU is pushing the MBP into heat conditions causing the FAN issues and in our case, possibly damage to the GPU.  


Apple had a similar issue with the 2018 MacBook Pro and people were starting to stick their machines inside a Freezer to see if they could avoid the CPU’s from stepping down prematurely.


Hopefully Apple can find a solution because these new 16 inch MBP could be incredible.


Please start a support case with Apple so we can get this resolved sooner than later and it will also protect you a bit more if you need to return your units beyond the return policy. Moving forward, its all on Apple!


Tim

4,224 replies

Apr 25, 2020 9:24 AM in response to TailsDog

DPJ ,


I understand you are feeling sick about people quoting how much money they've spent on there machines ... Blah blah blah


But your capricious outbursts feelings and emotional rants are off topic.



Please stick to facts and issues regarding the topic.


We. are a friendly community and people are trying to work together to find solutions regarding ‘ fan/ heating related issues ‘


we all appreciate your passion and useful

advise but we have to stick to the topic :)


thank you kind sir

Apr 25, 2020 4:04 PM in response to SzariK

"Guys :) If you put strong CPU with dGPU into a thin machine don't expect that everything works fine. Don't expect long life span either "


You're stating something as fact and that's not factual at all. There's been no known reports of MacBook Pro's with shorter life spans based on design.

Apr 26, 2020 12:55 AM in response to SzariK

Hi there,


I am also observing this thread since it was started, and me too I‘m still thinking of buying one. But to be honest- I‘m not sure if I should...


I am even thinking about if it would be the smaller problem to buy a 2019 15,4“ MBP, but there is still the issue with the butterfly keyboard. Not sure which problem is the worse...


Indeed after all the posts I have the question left, if the purchase of two new displays with accepting to work in clamshell mode could guarantee, that the fan speed would stay low when only connecting the display(s).


So can anyone make a suggestion if connecting two of these via DP and setting the refresh rate to 144 Hz could cause a „quiet idling“ in clamshell mode?


https://www.notebooksbilliger.de/hp+24x+gaming+display+620046?nbb=8f14e4&nbbct=4004_idealo


I still didn‘t get for sure how I can notice the difference between legacy/heartbeat-refresh displays and other ones...


Please excuse, that my english isn‘t that good, I‘m not a native speaker.

Apr 26, 2020 7:47 AM in response to DPJ

Most of the electronic parts will be fine, but one of the main enemies of li-po/li-ion batteries is heat, it shortens the lifespan considerably. So keeping the batteries in higher temperatures most of the day (due to the elevated temperature even if idle) will shorten the lifespan. There are some tables and scientific research that can answer how much. The battery will definitely last 2-3 years even in these conditions, but it will be in worse shape. I don't dare to give an estimate.

Apr 26, 2020 8:02 AM in response to daniel4663

What you're speculating doesn't turn into reality. You have to consider the way Apple channels the heat around the MacBook Pro on the inside. Unless you're part of Apple's engineering team creating the MacBook Pro you cannot make blanket statements here with theories based on "scientific research".


I'm honestly not sure why you're arguing about something you cannot prove when it comes to the MacBook Pro, especially the current one. I've been a dedicated Mac user for 25 years and I've had a truck load of Apple laptops and heat has always been discussed (which is typical for laptops, not sure why people expect laptops not to get hot?) and my batteries have always lasted at least 5 years without issue and I'm a power user running Final Cut Pro and I do audio production with Logic Pro X. Heat is something I've always experienced and has never affected my computers other than causing fans to blow as they should.


Once again please refrain from speculating. It's against the rules here.

Apr 26, 2020 9:12 AM in response to iTech23

"but this is not the discussion here, the problem here is that by just connecting an external monitor the machine will get really hot"


Right, you've said that many times. 😉


"So whatever the reason for this problem, software/driver/hardware if you use common sense you can agree that it shouldn't behave like that."


That was not the discussion I was having with the other poster. We were discussing his "theory" of the MacBook Pro's life span shortening due to heat.

Apr 26, 2020 11:45 AM in response to AppleSupportCommunityMember

" To William Kucharski, DPJ and others alike: there is a reason why everyone in this thread got the urge to Google the possibility of this being an issue and end up here. "


" Thank you for putting in the time and reading this long comment,"


TLDR; But the only reason I'm replying is because you put my name in your post suggesting that I am telling people they have no right to speak. I've never said any of the sort. What I've been arguing about is people making non-factual blanket statements that the heat generated and the fans blowing is shortening the life of the MacBook Pro. There are no known reports of this in the last 10+ years of Apple's history and Apple's laptops have always generated a great deal of heat. So please when you use my name in your posts don't suggest things I never stated.


Apr 26, 2020 8:19 PM in response to DPJ

DPJ,


We appreciate your expertise but your capricious treatment of others on this forum is very uncalled for. Let’s stick to subjects related to this particular thread : )


Please understand we are discussing things

and trying to find answers for our fan/ heating issues with our MBP 16 inch..


TalisDog Raimiss Thank you for all your hard work!!

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MacBook 16-inch Fan Noise

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