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 6, 2020 10:32 PM in response to DavidLaredo

DavidLaredo wrote:

I'd like to return it but im outside the returning time window. Besides the point is that apparently this is a generalized failure of the Mac rather than some isolated case. Paying more than 2400 USD for a computer with such defects and, furthermore, getting no fix or response from Apple even after 7 months and numerous reports its not just wrong but outrageous.


There are no defects here, just a product running differently than you expected it to, for whatever reasons.

Jun 7, 2020 10:40 AM in response to DavidLaredo

DavidLaredo wrote:

Are you telling me that getting my computer’s battery drained in less than 3 hours along with running super hot and noisy while doing absolutely nothing except being connected to a 1080p external display is not a defect?


Your MacBook Pro is not intended to run a modern external display on battery power (except maybe an iPad in Sidecar). Anything that happens, including draining the battery in only three hours, is not a defect.

Jun 7, 2020 11:00 AM in response to iTech23

Conventional wisdom when designing display systems was that Memory speed had to be fast enough to keep up MOST of the time, but could occasionally "miss", as long as it was only occasionally. Threshold of visual perception was closer to 1/6 second than 1/60th second.


You could always allow an occasional under-run (when data was not actually sent to the display when it was supposed to be) because the blank scan-line would only be there for 1/60th second, and would not occur in exactly the same scan-line next refresh period.


Then we started to use these systems quite literally for producing Hollywood Movies. Then it had to be perfect.


If I had my best fantasy, it would be to ask Apple to give Users a setting that allowed "good enough" display quality for daily use (with some under-runs allowed) in exchange for lower power requirements and less heat generated.

Jun 7, 2020 11:08 AM in response to Grant Bennet-Alder

Grant Bennet-Alder wrote:

Conventional wisdom when designing display systems was that Memory speed had to be fast enough to keep up MOST of the time, but could occasionally "miss", as long as it was only occasionally. Threshold of visual perception was closer to 1/6 second than 1/60th second.

You could always allow an occasional under-run (when data was not actually sent to the display when it was supposed to be) because the blank scan-line would only be there for 1/60th second, and would not occur in exactly the same scan-line next refresh period.

Then we started to use these systems quite literally for producing Hollywood Movies. Then it had to be perfect.

If I had my best fantasy, it would be to ask Apple to give Users a setting that allowed "good enough" display quality for daily use (with some under-runs allowed) in exchange for lower power requirements and less heat generated.

What are you talking about? Is it a hard job for this machine to put a few million pixels on a cable? A $30 Raspberry Pi can do it without a sweat..

Jun 7, 2020 11:37 AM in response to Grant Bennet-Alder

My old 13” MacBook Pro Retina early 2015 did it and without being as noisy and hot as this one. And I’ve tried windows laptops that do it as well. Pushing millions of pixels to an external display is no hard task, as somebody else mentioned even a raspberry pi can do it.


Why you guys keep defending a product that is clearly defective or has engineering flaws? And I’m no amateur I’m a software engineer who knows pretty well how all the internals of the computers are supposed to work. The behavior of this computer is just unacceptable.


My main concern is that given the amount of stress the computer is put to, to just display something in an external display will shorten the lifespan of the MacBook, and then after 2 or 3 years I’ll have to spend another 2K+ USD to get the new one with “better thermals” just as what they just recently did with the so called “magic keyboard” which is not even a new feature, they just “fixed” what they broke with the flawed “butterfly keyboard”

Jun 8, 2020 3:20 AM in response to Grant Bennet-Alder

Grant Bennet-Alder wrote:

The subtle distinction, and the reason this machine works "better" with Windows, is that they are not demanding perfection, i.e., no missed scan-lines.

No dude, there is no missed scan lines.. Please stop defending this crippled machine in stupid ways.. I've been using Windows and MacOS daily, just because some of my software requires GPU and some work in MacOS. I prefer carrying single machine.. I design embedded systems and driving a Full HD and even 4K does not require high bandwidth of RAM.. iGPU does it with shared memory!


What Windows drivers are doing is just turning down the parts that are not used.. It looks like AMD does not care MacOS as much as it cares Windows.. BTW, bootcamp drivers are old, and also full of bugs.. If I use GPU, it consumes as much as MacOS consumes..


This machine has totally wrong design.. I'll sell this machine as soon as my MacOS need is over, and buy 1/3th priced cheap Lenovo laptop.. With Ryzen, cheap laptops are not bad.. I can use them as "disposable" devices..

Jun 8, 2020 2:04 PM in response to savita88

You can, but the Discussions software has a bug that makes it more difficult than it should be.


Here's the process:


1) At the top of the page, you will see a black box with a check mark that reads "Following."

2) Click it and you will see it change to a white box reading "Follow."


Here is the important part:


3) Press ⌘R to reload the page, or click the ⟳ icon to reload the web page

4) If the box remains white, you are unsubscribed; if it turns black again, go to step 2.


Note it can take several attempts before this may work (and by several, I mean sixty or more, but it will eventually work.)

Jun 8, 2020 4:25 PM in response to jc_9

Since you believe the machine can't drive the displays the specs say it can, why don't you try it and if it fails, you can prove Apple is lying in their ads.


Personally I don't care what temperature it reaches, as long as it doesn't reach thermal shutdown. That means the machine's thermal management is working properly.


I don't care about CPU temps either, for the same reasons.


For example, if the fans were at full blast whether it's driving one or four monitors, it's no big deal. You don't know whether there is headroom or not, so why speculate?


As far as Rossman goes, being anti-Apple and criticizing their engineering is his thing, it's how he draws viewers and makes money.


If it was so easy for Apple to do what he suggests and it would be so wonderful, he wouldn't have a business.

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MacBook 16-inch Fan Noise

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