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

Jun 10, 2020 12:38 PM in response to Dogcow-Moof

William Kucharski wrote:

This is a complete mischaracterization of the GPUs; the 5500M is also substantially faster with more capability.

A large SUV will use substantially more fuel than a tiny compact car even if both are just used to drive a mile down the street at 25 MPH.

This is totally "reality distorsion".. What Apple learned from Steve Jobs..


A SUV have to carry all of its body.. In electronics, an SUV can be as fast and as fuel efficient as a tiny compact car.. Watts per instructions are in a decreasing trend for last 10 years.. A 9th gen CPU idles 1-2W as 4th gen was idling at 10W.. A 9th gen does a lot more at 45W.. etc..


Stop defending this nonsense.. Other computers are using much more powerful chips and they cand idle below 10W easily.. Nobody complains fans ramping up when they are exporting video.

Jun 10, 2020 1:48 PM in response to denizcan

Thanks :-) If I'd get a 16" MBP I'd want to run it with ext display most of the time. So I'll just wait a little and see how this story develops.


For my children it's another story, they will hook their unit up to an ext display only once in a while.


So the 10th gen chips get hot you say. Maybe that explains why the lower end 2020 MacBook Pro 13" that I am currently testing doesn't spike up the watts when connected to a 30" Apple Cinema Display. See image.


I was actually contemplating on sending this one back and ordering 3 new 2020 higher end models for my children. Specs:

  • 10th gen chips
  • dual fans
  • 2.0 GHz processor
  • 4 TB3 ports vs 2


But now I am puzzled. Maybe by getting the 10th gen chips I could be buying a hair dryer....

Jun 10, 2020 2:00 PM in response to PhotogWithMac

You could buy it and if it doesn't meet your expectations just return it. I watched a recent torture test between the new 13" MBP and the 16" MBP and the 13" got hotter quicker and was much slower. The fans were also louder on the DB levels.


It easily has met my expectations. Between my 2016 2018, 2019 15" I never really noticed much of a speed increase. Once I got the 16" it was a major, noticeable, improvement.

Jun 10, 2020 11:52 PM in response to brycesteiner

brycesteiner wrote:

You could buy it and if it doesn't meet your expectations just return it. I watched a recent torture test between the new 13" MBP and the 16" MBP and the 13" got hotter quicker and was much slower. The fans were also louder on the DB levels.

Yeah, I know all about the return process now, as we already sent back 4 2020 MB air units and now this 13” MBP is going back too. it’s still a pity that the 2020 Air was so loud, otherwise it’s a beautifully styled and light machine with a great display and good price.


could you provide a search string for the torture test you mentioned (links get removed a lot here)? I’ve seen a couple from maxtech but I’d like to see more in depth details.


basically it’s still a kids notebook purchase that I’m looking at now. Of course it seems logical that the $2400+ 16” can performs better than the $1799 top range 13” pro, then comes the $1299 13” pro and then the $999 Air. And my kids don’t even need the power of a pro machine at all, but I want to give them a machine that doesn’t start the fans so easily.


when I pay almost double the price for a $1799 MBP compared to the air ($999) the machine will last twice as long and will be more of a joy to use.


I think I will just try the $1799 model and see how it does. If there’s anything worth mentioning I’ll report back here.

Jun 11, 2020 10:07 AM in response to TimUzzanti

I'm behind in the forum in regards to knowing what is exactly going, but my question is; has anyone had their issue resolved, besides making a full refund or using third party apps? Also, is there a software (I understand that Intel is a factor in the issue) fix that can resolve or relief the issue? That's if Apple chooses to address this issue at all... Still in my 14 day return window.

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MacBook 16-inch Fan Noise

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