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 11, 2020 12:34 AM in response to ahmedfromreservoir

I'm start thinking that the best what we all can do now is to inform about the issue as much media / blogs / YT channels as we can.


It's odd that every single review I read about this mac said nothing about external monitors. I suppose that they don't event tested it so they didn't notice any issue and this is why there is no info about this issue in media.


Maybe when media will start talk about issue this would force Apple to do something because it's 3 months from the release...

Feb 11, 2020 12:57 AM in response to papsa

papsa wrote:

I'm start thinking that the best what we all can do now is to inform about the issue as much media / blogs / YT channels as we can.

It's odd that every single review I read about this mac said nothing about external monitors. I suppose that they don't event tested it so they didn't notice any issue and this is why there is no info about this issue in media.

Maybe when media will start talk about issue this would force Apple to do something because it's 3 months from the release...

I was thinking about highlighting this issue to some popular tech YT channels e.g Linus Tech Tips. I'm sure they would be more then happy look into this and make a video about it.

Feb 12, 2020 5:59 AM in response to TailsDog

Once again, that depends entirely on your use case for the machine.


None of the reports here indicate the MBP has gone into thermal shutdown or otherwise has failed to do whatever it is asked to do, just that it seems to be heating quickly and the fans run loudly while it does so.


Apple does design their machines to shut down if thermal parameters are exceeded, so even if you believe it is running too hot, if it does not shut down, it isn't.


The reports of graphical glitches and such seem to be unit to unit failures that may be addressed by repair, save for glitches when connecting/disconnecting eGPUs.


I would have no issue recommending the MBP 16 to anyone in the market, especially if I knew they didn't use an external monitor or know what laptops with really loud fans (looking at you, Acer Ferrari 3400) sound like.

Feb 12, 2020 9:01 PM in response to BradyT_

BradyT_ wrote:

Is this worth cancelling an order over? I have a MBP 16 in processing and work with external monitors everyday. This would be unfortunate.

If I were in your shoes I'd cancel it, but I've been burned twice so far on the MBPs.


You could be lucky as some people swear up and down it doesn't happen to them, so maybe worth getting it and seeing, otherwise return it quickly.

Feb 13, 2020 4:09 AM in response to EngagingExposures

And when you open the lid you will not be able to sync your photos or Mail.app can get stuck syncing because of the thermal daemon suspends all sync processes and starts waiting till the machine becomes cooler and this will never happen. As we discussed here many times, and until now no one could show the opposite: every MBP 16 doesn't work properly when it is connected to an external display while lid is opened.

Feb 13, 2020 5:52 AM in response to brycesteiner

I didn't say these issues happen for everyone, it clearly does work fine for some people in certain situations. A lot of people however are experiencing the same issues.


I have the 2.3 i9, 16GB with 5500M 4GB linked to a LG 34WK95U


I don't disagree that there are a lot of things to like about this MBP and of course nothing is perfect, I just really hope that there can be a fix for these problems sooner rather than later.


It's cold winter where I am now, in the summer the ambient room temps will go up and if it is not fixed it will make this problem even worse.

Feb 13, 2020 6:17 AM in response to TimUzzanti

TimUzzanti wrote:

Totally agree. This is supposed to be a professional machine that is supposed to be hooked up to a ton of devices to do some heavy lifting...

William, I have an off-road vehicle I would be happy to sell you... but you have to keep it on the road. It doesn't work well off-road.


Actually, you have that backwards.


You bought a laptop that can be connected to all kinds of external devices, so you bought an off-road vehicle but are upset at its highway manners.


If your primary use case is connected to one or two external monitors, get an iMac Pro or better yet, a Mac Pro.

Feb 13, 2020 7:35 AM in response to Dogcow-Moof

I actually 100% disagree with you William. It is the portable use case that makes the MBP the computer I have chosen for 14 years.


Also, another point; I am not a video editor or developer, I just want a powerful machine that won’t break a sweat doing the easy stuff. That includes just plugging in a monitor.


Ok, everyone doesn’t have this problem, but enough of us Radeon 5500 users are having it and there needs to be a solution. I would happily return mine for a standard graphics version and buy a Razer Core X and get my power on the desk with the portable form factor.


it isn’t about unreasonable expectations, it’s about it working the way it was pitched by Apple.

Feb 13, 2020 10:14 AM in response to fmorga

Indeed and it sounds like the tip of the iceberg looking at other forums and blogs.


One thing I will say is a lot of people with this problem are not negative, they are looking for solutions and spending time troubleshooting, optimistic even. The original poster has spent months on this, they are dealing with a lot of machines and even been sent new units from Apple and from what I understand 100% have had thermal issues surrounding the GPU.



Feb 14, 2020 4:08 AM in response to antonreshetov

The CalDigit dock is great for me in clamshell mode with dual displays. My computer stays quiet (but mine isn't loud or overly hot directly connected either) in clamshell unless I'm really driving it, which is the way it should be, and then quiets down when the tasks are finished. Maybe I just keep my rooms cooler?


Many of my posts have been deleted because of the secret information I've been posting. I apologize Apple.


Right now with the screen open I'm at 26C. I only have mail and teamviewer, safari and parallels open (paused). I'm also not connected to the dock.


FYI I noticed last night that if I had jAlbum opened my RFS wattage would be at 7 (disconnected from Dock), but when I closed it would drop to .08W. Apparently software can makes calls to increase or decrease when closed.



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MacBook 16-inch Fan Noise

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