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 21, 2020 10:01 AM in response to Dogcow-Moof

I didn't said that Apple Support technician said that there is a lot of people with this problem.

I said that Apple will propaably start recovery program if there will be a lot of people with problem.


I also pointed to him that there is no option to install older version of macos but he claimed that this can be done.

I'm new Macbook user so I believed to him...

Apr 21, 2020 11:31 AM in response to Dogcow-Moof

William Kucharski wrote:

Spinning up a VM instance (Parallels, Virtual Box, etc.) is far from a light task, in fact it's one of the most processor-intensive things you can do short of working with multiple streams of 4K video in real time.

I would have to say that is not true, I've been using VirtualBox for years with no problem like this. In fact I was using VirtualBox with a mid 2015 MPB with a Dell 5k monitor with no heat issues at all. That machine would not struggle like my 16 MPB. Just one of the reasons I question the behaviour.

Apr 21, 2020 11:48 AM in response to DPJ

Those monitors are connected to a windows computer and he mentioned this: "I haven't had the MBP driving the monitors for extended periods. Usually running the PC on both monitors and the MBP on the side. I would imagine the fans would spin up pretty quick though."

So he is guessing that if he connects the Macbook to the external monitors the fans will spin pretty quick.

You just lied to our faces.


Apr 21, 2020 11:50 AM in response to raimiss2

Doesn't matter. This forum states that just simply connecting an external monitor to the 16" MBP causes the fans to blow incessantly without doing anything. He's connected to two monitors. Seems as though only CERTAIN conditions are causing the fans to blow incessantly and people are discrediting facts by downplaying one's setup, even when it shown right in plane sight.

Apr 21, 2020 11:59 AM in response to TailsDog

I'm not all concerned what's on his screens. I'm going by what he stated that when connecting his 16" MBP to both external monitors. He's had no issue with fan noise. And it doesn't matter that he stated that they might run on high after an extended period of time. People on this forum state that the moment the MBP is connected to an external monitor the fans instantly blow without doing anything. Doesn't seem to be the case with that poster. Nice try about the Windows thing. That wasn't the point. 😊

Apr 21, 2020 12:04 PM in response to DPJ

Can you show us where he said that? Someone asked him and he replied this:

"Nah just 1080. Not sure...I haven't had the MBP driving the monitors for extended periods. Usually running the PC on both monitors and the MBP on the side. I would imagine the fans would spin up pretty quick though."

So he never said that he has not problems.

Failed again.

Apr 21, 2020 12:13 PM in response to DPJ

DPJ,


unlike most of us here you are One of the few successfully running external monitors, running google chrome , watching movies without heat issues or fans spinning at top speeds! Do you have any screenshots to share with us?


the community would highly appreciate it : )


please update us your expertise!Thank you for your contributions!


Do you think there may be any future driver or software updates that my resolve these issues? Your expertise is highly appreciated !


thank you kind sir!

Apr 21, 2020 12:26 PM in response to DPJ

The issue is we have taken it up with Apple directly, even having a call with a regional Business Team manager. We were told that our issues would be escalated and that they would take care of it. But that's as far as it's gone -- we've had no other updates from anyone. Therefore, these forums are another step in making sure Apple is aware of what's going on.


You, and I'm sure others, have one experience, but there are a lot of us who are obviously having a different experience, and these experiences keep us from being able to have the same outlook as you. We want these to work for us, but at the moment, they aren't a good fit.


I am interested in that link you posted, as others have noted -- It would be helpful if it proved your point, but I don't believe it did. I also know our CEO had linked to others having similar issues as ours, but those links were removed/moderated. I think others have had similar things moderated, yet that Reddit post wasn't.


Apr 21, 2020 12:27 PM in response to RICHD101

After being a level 3 member with 900 points and 17 years on this forum along with 25 years of being a Mac user exclusively I've contributed very nicely to Apple Support Forums. My 16" MBP is playing very nicely and I do very heavy work on it. It's not giving me any problems such as erratic screens that somehow appeared today that were never discussed before. It's important that newcomers read positive experiences along with the plethora of negatives so they will understand not everyone is experiencing such problems.

At this point it's best that you and a few others simply ignore my posts as I will continue to help others as I have. I also noticed that someone stated that an Apple technician told them to install Mojave on their 16" MBP and nobody but me and William questioned that, knowing that you cannot install Mojave on it. I'm reading between the lines here of who's being genuine towards me, so have a great day. 😉

Apr 21, 2020 12:30 PM in response to BeatnikMoon

"Therefore, these forums are another step in making sure Apple is aware of what's going on."


You may have missed the posts earlier explaining that Apple doesn't come here reading threads. This is a community of Mac users sharing experiences. If someone has a solution that's great, but Apple does not play Big Brother here. After 5 months of this thread and some haven't gotten their concerns resolved you'd figure members would see that by now.

This thread has been closed by the system or the community team. You may vote for any posts you find helpful, or search the Community for additional answers.

MacBook 16-inch Fan Noise

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