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Because it's a hardware problem. The GPU needs to run at higher speed to sync multiple displays at different resolution and refresh rate. The 5600m has 2x faster memory. Maybe it doesn't need to run the memory at max speed (half speed is fast enough)...

Is there any easy way I can test this?
 
Nice. Hopefully 5300/5500 will get an update as well.
I just ordered a dell u3419w and will report how it works with DP or usb-c cables as soon as I get it.
I also did some more tests Today and on my up2716d in clamshell mode the power draw went down from 18.34w to 17.50w lol and that's while trying all possible combinations with/without switchresx and etc.
I swear I wish I didn't need this laptop.
 
Nice. Hopefully 5300/5500 will get an update as well.
I just ordered a dell u3419w and will report how it works with DP or usb-c cables as soon as I get it.
I also did some more tests Today and on my up2716d in clamshell mode the power draw went down from 18.34w to 17.50w lol and that's while trying all possible combinations with/without switchresx and etc.
I swear I wish I didn't need this laptop.

FYI this monitor has an annoying bug when sleeping that it will scan the Macbook and you'll hear a 'charging bong' from the next room every few minutes. I'm returning mine because of this. LG 38UC99 was the only logical replacement :p
 
FYI this monitor has an annoying bug when sleeping that it will scan the Macbook and you'll hear a 'charging bong' from the next room every few minutes. I'm returning mine because of this. LG 38UC99 was the only logical replacement :p

I read about it and to be honest with you I'm ok with it as I never put my screen to sleep anyway.
Once I'm done I shut the computer off every single time and disconnect from power. Maybe not the most streamlined experience lol but I'm doing this way since I remember.
Also got it brand new from dell today for $704 delivered which is a nice discount and I love the resolution.
 
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Sure, I checked the "use simplified settings" box and tested all options from the dropdown. The one in the screenshot, "GTF", is the only one that worked. I'm attaching a screenshot of the default settings as shown by SwitchResX vs the GTF settings. I don't know exactly why these settings bring it back to 6-7W but it worked for me.

GTF - 6-7W:
View attachment 922827

Default Settings - 18W:
View attachment 922828
[automerge]1591728449[/automerge]


It's a Philips 326E8FJSB


Needed some help. So I have a dual monitor setup - one 29" LG Ultrawide and a regular LG 1080p 22" monitor. I switched the resolution of the Ultrawide monitor to 1080p using SwitchRes X and the dGPU power consumption dropped to 5W instantly. However, irrespective of what frequency/scan rate I select for the native 2560 x 1080 resolution, the power draw jumps to 17-18W. Any help? I tried the settings in your screenshot as well to no avail.
 
[automerge]1593409659[/automerge]
I received a base 16" today and am disappointed because it get's as hot as my 2017 with an external 4K monitor.

Is anybody else experiencing the same issue? I always work with external monitors and running on high resolution and this heating performance is upsetting. It's not cooler than the 2017 version in this respects.

Can you guys share your thoughts on this?

Thanks a lot!

Good to watch:
 
HBM2 memory is known for having lower power consumption than GDDR6, so it's safe to assume it plays a major part in the numbers alexktz shared us.

"The huge jump" is not specific to the 5300M / 5500M, even nVidia desktop cards do this. For example on my Windows desktop, I have a Geforce GTX 980 running 2 x 1440p@60hz and one 1080p@60hz.

One monitor: 11.5% TDP
Two monitors: 11.7% TDP
Three monitors: 27.3% TDP

It's a desktop GPU thought and the fans stays silent (1400RPM) even when using 27% TDP but I remember not having this huge jump with the same monitors a couple years ago.
Like others wrote, it doesn’t explain why 5500m on windows works better at 11-14w than 18-20w on MacOS...
 
Okay, I can return my MacBook today for the final window.

Does anyone who has been in contact with Apple have an update on this engineering issue and solution?
I cannot use this MacBook for any audio or video engineering due to the noise in the same room.
 
due to the fact that it’s a stacked memory, the relative area of the PHY controller is much smaller for HBM2, with GDDR6 taking up as much as 1.5-1.75 x the area of HBM2’s controller. This also means that GDDR6 consumes 3.5-4.5 x the power when compared to HBM2.

Source: https://www.techsiting.com/gddr6-vs-hbm2/

Almost certainly any improvement to fan speed and heat and power consumption from the 5600m is 100% a result of the change to hbm2 memory, and no fix will be forthcoming for the other GPU options.
 
Source: https://www.techsiting.com/gddr6-vs-hbm2/

Almost certainly any improvement to fan speed and heat and power consumption from the 5600m is 100% a result of the change to hbm2 memory, and no fix will be forthcoming for the other GPU options.
It's still a driver or software issue. However, I agree with you that it probably won't get fixed by Apple.
 
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Source: https://www.techsiting.com/gddr6-vs-hbm2/

Almost certainly any improvement to fan speed and heat and power consumption from the 5600m is 100% a result of the change to hbm2 memory, and no fix will be forthcoming for the other GPU options.
Like I wrote earlier, it doesn’t explain why 5500m on windows works better at 11-14w than 18-20w on MacOS...
Could someone please verify 5500m usage under bootcamp?
 
I bought my mbp 16" in December and have used it without a external screen since then.
Last week I bought a BenQ PD3220U, plugged it in, and mere seconds later my joy turned to horror.

I work a lot with audio and its impossible to work with this setup.

I've been in contact with Apple in Sweden and the senior rep I spoke to last week recorded some logs to send to the "engineers".
Today I read up on this thread and heard about the updated 16" with the 5600M. I called them and asked if a trade (with money in between) would be possible. Didn't get much of an answer except they have to wait for a reply from the "engineers" but I doubt it will be.

I also asked if the rep knew about this issue and he was reluctant to answer but said that he could see a few similar cases.

He said this would likely be fixed in an upcoming update.
But from a customer point of view this is a disappointing answer. Who knows how long that will take. I need to use this setup for work now.

In istat pro I see the high GPU drawing 19w without load. If I clamshell it goes down but its still hot and noisy.
I tried turning off the turbo boost and it helped a bit but not enough for me to have it turned off.
Simple browsing and YouTube puts the temps up to 80C and the fans runs at almost max. Keyboard also gets very hot to the touch.

I researched this computer very intensively before buying it and I haven't seen a single review or article mentioning this issue. But if you put "MacBook Pro 16" heat" in google there are so many hits.
Very odd.
 
My monitor is Dell U2719D.
My refurbished mac is;
2.6 GHz 6-Core Intel Core i7
32 GB 2667 MHz DDR4
AMD Radeon Pro 5300M 4 GB
Intel UHD Graphics 630 1536 MB

It is heart pain to see and hear my new (yes refurbished. but its new for me) mac fan spinning crazy.

With HDMI cable through Baseus usb c hub, draw 18+W by Radeon High Side, regardless of clamshell mode or not.
I tried one another brand of usb c hub also. Still the same issue.

Then I tried SwitchResX method as a few suggested in this thread started from page 75.
But it is not working for me.

Then I started seeing Displayport solutions in this thread.
So I bought a Displayport to usb c cable.
Now it draw only 5+W by Radeon when using clamshell mode.
Once laptop monitor open, it immediately raise to 18+W.
After close lid again, waited like 10 minutes, but it is not dropping back to 5+W.
So I restarted the mac in clamshell mode and it drop back to 5+W.

After play around with Displays setting from System Preferences, 18+W issue come back.
Then found out that SwitchResX also plays a role to make this remedy works.
This is the setting that works;

1593433859777.png


1593434312744.png


And for extra touch, I disabled the cpu turbo boost also.

With this issue, mac book pro is not so "pro" after all.
Now I have to use in clamshell mode until this issue is resolved.
Finger cross and hope this is just software bug and could be able to resolve in near future.
I posted a feedback to apple also. Hope apple will listen the voices and make the software fix faster, if it is fixable.
 
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It's still a driver or software issue. However, I agree with you that it probably won't get fixed by Apple.
Without changing the underlying requirement to run GPU memory at high speed with multiple displays at varying resolutions and refresh rates, it seems that this is purely a hardware issue (which is working as designed) and a hardware "fix" has been provided in the 5600m which just uses less power (and coincidentally also performs better).

It seems unlikely that AMD or Apple would or could change the underlying behaviour, which is by design, and is present in desktop GPUs (where the larger thermal envelope makes it not so much a problem) and presumably needed to avoid poor performance with multiple displays. (See earlier reports of "laggy" scrolling in some cases when dGPU is reduced to ~5w.)

I wouldn't hold out any hope at all that this behaviour will ever change in any MBP with a Navi dGPU and GDDR6 memory.

I think the same behaviour will not be a problem with Apple Silicon MBPs, but there will no doubt be other issues with those machines.

I wish the 16" MBP still had the old 560x Polaris GPU as an option, which is fast enough for my needs and draws less power also without costing $1200 AUD. Combined with the additional 12W thermal envelope of the 16" MBP, would have been a pure win on CPU and GPU performance (via increased thermal capacity). While the 5300m and 5500m bring better performance, the increased power consumption negates the benefit of improved thermals.

Like I wrote earlier, it doesn’t explain why 5500m on windows works better at 11-14w than 18-20w on MacOS...
Could someone please verify 5500m usage under bootcamp?
I believe Windows GPU requirements for drawing the UI itself are much lighter than macOS, which uses 3D a lot to render its mostly 2D interface. WindowServer is doing a lot more than the Windows equivalent, and I'd expect that to translate to additional power draw at baseline (idle).
 
Without changing the underlying requirement to run GPU memory at high speed with multiple displays at varying resolutions and refresh rates, it seems that this is purely a hardware issue (which is working as designed) and a hardware "fix" has been provided in the 5600m which just uses less power (and coincidentally also performs better).

It seems unlikely that AMD or Apple would or could change the underlying behaviour, which is by design, and is present in desktop GPUs (where the larger thermal envelope makes it not so much a problem) and presumably needed to avoid poor performance with multiple displays. (See earlier reports of "laggy" scrolling in some cases when dGPU is reduced to ~5w.)

I wouldn't hold out any hope at all that this behaviour will ever change in any MBP with a Navi dGPU and GDDR6 memory.

I think the same behaviour will not be a problem with Apple Silicon MBPs, but there will no doubt be other issues with those machines.

I wish the 16" MBP still had the old 560x Polaris GPU as an option, which is fast enough for my needs and draws less power also without costing $1200 AUD. Combined with the additional 12W thermal envelope of the 16" MBP, would have been a pure win on CPU and GPU performance (via increased thermal capacity). While the 5300m and 5500m bring better performance, the increased power consumption negates the benefit of improved thermals.


I believe Windows GPU requirements for drawing the UI itself are much lighter than macOS, which uses 3D a lot to render its mostly 2D interface. WindowServer is doing a lot more than the Windows equivalent, and I'd expect that to translate to additional power draw at baseline (idle).

Just read what the guy above you wrote about restarting the mac in clam shell vs open and then close the lid.
First case power draw is low, second scenario power draw does not go down even though the screen is off. I will actually test this today and if true then this is 100% software bug.
Will apple will fix it? well that's a whole another story.
 
So my Apple Care case was "escalated to an engineer" by the Apple Support person I spoke with last week. They got back to me today and, unsurprisingly, advised that the engineer's conclusion was that the fan noise and heat was "expected behaviour" :mad: I mentioned the following:

  • If I'd known this was "expected behaviour" I would not have bought it.
  • That the marketing still promotes the fact a MBP16 can be connected to 2 6K displays, I only have a single 34 inch ultra-wide monitor so how can that be a problem?
  • That this problem seems to be consistent with the 5500 GPU but not the higher end 5600 GPU.
  • That I don't in any way find this response acceptable.

Next step is to get an appointment at a Genius Bar so they can check it out themselves. Again, as expected.

Disappointing, really.
 
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So my Apple Care case was "escalated to an engineer" by the Apple Support person I spoke with last week. They got back to me today and, unsurprisingly, advised that the engineer's conclusion was that the fan noise and heat was "expected behaviour" :mad: I mentioned the following:

  • If I'd known this was "expected behaviour" I would not have bought it.
  • That the marketing still promotes the fact a MBP16 can be connected to 2 6K displays, I only have a single 34 inch ultra-wide monitor so how can that be a problem?
  • That this problem seems to be consistent with the 5500 GPU but not the higher end 5600 GPU.
  • That I don't in any way find this response acceptable.

Next step is to get an appointment at a Genius Bar so they can check it out themselves. Again, as expected.

Disappointing, really.

This sucks.
I have a feeling they are trying to prevent mass recall or something.
 
So my Apple Care case was "escalated to an engineer" by the Apple Support person I spoke with last week. They got back to me today and, unsurprisingly, advised that the engineer's conclusion was that the fan noise and heat was "expected behaviour" :mad: I mentioned the following:

  • If I'd known this was "expected behaviour" I would not have bought it.
  • That the marketing still promotes the fact a MBP16 can be connected to 2 6K displays, I only have a single 34 inch ultra-wide monitor so how can that be a problem?
  • That this problem seems to be consistent with the 5500 GPU but not the higher end 5600 GPU.
  • That I don't in any way find this response acceptable.

Next step is to get an appointment at a Genius Bar so they can check it out themselves. Again, as expected.

Disappointing, really.

This makes me so sad to read.
I bet I will get the same reply as you.

Only real option I have then is to sell the machine and buy the 5600 one and that will be a very tough pill to swallow.
 
Nah, keep arguing with apple, say you got AppleCare to avoid being stuck with lemon products and how you have faith in apple products -- this is my position, I've has Microsoft products and some had engineering flaws and Microsoft simply replaced it with a working unit that had them fixed, a newer unit.

Now I did have extended warranty, so there it would be very shameful if Microsoft gives better support than apple.

Keep pushing for a solution and fill us in.


Apples AD
Screen Shot 2020-06-29 at 10.20.31 AM.png
Screen Shot 2020-06-29 at 10.22.10 AM.png
 
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My monitor is Dell U2719D.
My refurbished mac is;
2.6 GHz 6-Core Intel Core i7
32 GB 2667 MHz DDR4
AMD Radeon Pro 5300M 4 GB
Intel UHD Graphics 630 1536 MB

It is heart pain to see and hear my new (yes refurbished. but its new for me) mac fan spinning crazy.

With HDMI cable through Baseus usb c hub, draw 18+W by Radeon High Side, regardless of clamshell mode or not.
I tried one another brand of usb c hub also. Still the same issue.

Then I tried SwitchResX method as a few suggested in this thread started from page 75.
But it is not working for me.

Then I started seeing Displayport solutions in this thread.
So I bought a Displayport to usb c cable.
Now it draw only 5+W by Radeon when using clamshell mode.
Once laptop monitor open, it immediately raise to 18+W.
After close lid again, waited like 10 minutes, but it is not dropping back to 5+W.
So I restarted the mac in clamshell mode and it drop back to 5+W.

After play around with Displays setting from System Preferences, 18+W issue come back.
Then found out that SwitchResX also plays a role to make this remedy works.
This is the setting that works;

View attachment 929011

View attachment 929014

And for extra touch, I disabled the cpu turbo boost also.

With this issue, mac book pro is not so "pro" after all.
Now I have to use in clamshell mode until this issue is resolved.
Finger cross and hope this is just software bug and could be able to resolve in near future.
I posted a feedback to apple also. Hope apple will listen the voices and make the software fix faster, if it is fixable.

Thanks for this. I have ordered a USB-C to DP cable, will report my findings here.
 
Okay, I can return my MacBook today for the final window.

Does anyone who has been in contact with Apple have an update on this engineering issue and solution?
I cannot use this MacBook for any audio or video engineering due to the noise in the same room.

Do you have to ship it back today or just initiate the return? If you can go up to a 5600m config, I'd return what you have, order one of those. It'll take 2 weeks to get here, then you have 2 weeks to initiate, another 2 to send it back so 6 weeks or so to see if they fix the 5300/5500, and then do the same thing again if you want. I wonder if you do order a 5600m and call Apple, explain you want to wait for the new one to arrive to transfer your account over, maybe they'll let you keep what you have longer. I'm doing this exact same process, waiting to see my shipping date on the 5600 before calling Apple for a return extension (still have 10 days or so). At the end of the day for my needs I'd much rather save the money and get a refurb (what I have now) so hope there's some fix coming to the 5300/5500.
 
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