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

Feb 22, 2020 7:10 PM in response to Grant Bennet-Alder

Grant Bennet-Alder wrote:

Google Chrome is not a good example, because it OFTEN turns on the Discrete Graphics chip, which is thought to be the cause of everything on this discussion.

If you want to make this argument, please use a different Browser as your example

If you clicked the link I literally posted in response to your comment instead of trying to formulate yet another weak argument to justify the horrible thermals on the MacBook you would have seen I did you one better,


MacBook Pro 16" running on idle with fans on fullblast: https://www.youtube.com/watch?v=pJT660pUOMc


No browser to speak of.


There is no flame war, there is you an dall the defenders who are objectively wrong and unhelpfully trying to defend this abnormal behaviour as if it were normal, and there are frustrated people like myself trying to find a solution.

Feb 22, 2020 7:41 PM in response to ahmedfromreservoir

ahmedfromreservoir wrote:
What's outrageous is claiming a browser running an online forum should cause a laptop to overheat.


It overheated? Do you have a photo of the screen showing your MBP 16 notifying you it is shutting down to cool?


In fact, the fans running is a sign it is managing the thermal load properly.


You can of course argue whether something should be generating so much heat with that load, but the laptop is not “overheating.”

Feb 22, 2020 8:09 PM in response to Dogcow-Moof

100% agreed! People first complained that the 15" was throttling due to poor thermals. Apple fixed that with new fans which are tuned to deal with high CPU or GPU usage. I'm not saying this can't be worked out better but for some people here to use words "defective fans" and "overheating" are putting out misinformation and some want to cause negativity by saying they can't recommend a perfectly great computer just because it doesn't perform the way they want it to. Then if your opinion differs from theirs they end up hurling insults.

Feb 22, 2020 9:24 PM in response to DPJ

I completely agree. This computer is great and is the best MBP I've ever owned in many ways. There are a few people experiencing overheating issues, but mine is not one. The biggest problem I seem to have is it's tighter in my backback than the 2019 15".

I've ran the test that people have asked and it always comes out fine. The fans turn up when it gets warm and cools down quickly when it's done working. It doesn't matter if it's in clamshell mode or not, connected directly to multiple 4k screens directly or through a dock.

If you are having problems, return it until you get a good one. I certainly wouldn't trade mine.

Feb 23, 2020 11:01 AM in response to TimUzzanti

My 16 inch Macbook has issues with reduced h264 encoding speed vs my 2015, but fan noise...mine tries to stay silent until it is basically at the T junction, then it slowely ramps up. I have been doing a LOT of FCPX exports and Compressor transcodes in testing with Apple Care for my h264 issue, so I am working the CPU and generating high temps frequently, and high fan speeds at low temps is not something my weird Macbook is doing.


Catalina 10.15.3 since new if that matters.



Paul

Feb 23, 2020 10:27 PM in response to TimUzzanti

So besides everyone here discussing recommending the 16" or not to others. Is there any solution for this ? it's clear that for some people, including me that the fan noise is not acceptable. And people should by one and try it out themselves. Because it's relative to people if it acceptable or not. But i would recommend people who doesn't find this acceptable to return it if the laptop is not essential for them. Because sticking with it and finding out that the issue would not be resolved then you will be stuck with a device that you're not satisfied with. I will be following this thread and sadly maybe wait for the updated 16"....

Feb 24, 2020 12:05 AM in response to RICHD101

"My fans are going wild running Logic Pro X without an external monitor "


Well then it's something to do with your setup and the types of software or plugins you have installed that is causing that. I do very extensive audio editing in Logic Pro X on my 16" and the fans are barely audible in a quiet room with no monitor connected. In fact Logic Pro X doesn't even activate the dGPU so it's definitely something in your own setup that's causing that.

Feb 24, 2020 12:50 AM in response to Intellinto

**** it ***** solutions seem to revolve around downspeccing. Though some people had better resultss with different cables? Crazy.


Although someone pointed out the pro display xdr connected wasn't causing issues on a demo macbook which makes me beieve this is an issue affecting a sizable number of macbook pros but not all.


Just waiting on the backorder from Apple on the replacement logic board (there's probably a huge backlog of orders from people experiencing issues), hopefully that resolves the issue I'm having.


Has anyone else here found any success with a replacement logic board?

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MacBook 16-inch Fan Noise

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