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To anyone on here searching for a solution (PLEASE READ):

A few things to definately do and try:

1. Try different resolutions (Many people have had success with even higher resolutions it makes no sense I know, but it seems different monitors and cables can act differently) For me 1080P at 50Hz draws 5Watts from the GPU idle not 20W. (I'm running dual monitors in clam shell)

1.a) Get istats to see GPU radion High side. You need to get the wattage to about 5watts and not 20watts to see heat reduction.

1.b) Clamshell mode / get a stand that keeps the bottom off the desk for better cooling

2.Try different refresh rate. As above for me 50HZ is the sweet number and its basically the same refresh rate as TV so I don't notice any difference between that and 60HZ. Weirdly people have also had success with 144HZ but you need the correct monitor for it obviously!

3. TG PRO. The fan curves on the 16 are messed up, even when you compare with the previous 15 inch version. TG Pro allows you to set the fans to auto come on at certain temps. I have mine set to fans at 45% fans or (roughly 3500 rpm ) at 75 degrees. I have a fail safe set for 100% fans if the computer hits 95 degrees. Even if you / apple have the fans at 100% it only makes 5-8 degree difference under continued load. Ive tested it. Apple claim that theres no heat issue as the laptops otherwise they would shut down, the thermal limit of the cpu is 105 I believe. In effect you get the same performance no throttlng i9 CPU is at 3.7GHZ continued load regardless of fan at 100% or fan at 50%, but you do get 8 degree increase in temps (who cares)! Apples fan curves on the 16 are way too conservative and wrong! And if it does melt (its fine), well apple can replace that under my 3 year warranty.


4. gSwitch - Free software, allows you to stay on intergrated and save power and battery and blocks gpu hungry apps and makes them go to intergrated. Doesn't work with external monitors but still worth a mention.

5. Turbo boost Pro - Underclocks the CPU to base clock. I rarely use this now but it is useful If I want more thermal headroom and don't need the power. Turns the 8core into a 6core essentially in terms of power.

With all the above tips Ive got my 2.3ghz i9, 16gb, 1Tb, 4GB 5500m machine working how it should have been from the start! The only minor gripe is that Im running 1080P resolution on dual monitors, but its minor because I was upscaling 2k anyways. I use my laptop for music and slam my processor with heavy sessions and now it goes to 3500 rpm at roughly 80 degrees for sustained loads at 3.7ghz clock. I'd say 3500 is reasonable and not loud, try it yourself!

Like alot of people I got stuck with my machine after returns was closed and apple claimed it wasnt a problem! I would not pay another 700 for the best graphics card especially with the ARM switch.

Do this enjoy your laptop for 3 years and get the new ARM ones when they are good and ready.

Bless up peoples.
 
To anyone on here searching for a solution (PLEASE READ)...

Thank you for the detailed solutions. Too add to your solution, i found this solution on reddit but please be careful as the downside is quite dangerous for your skin.

I'm not quite sure if the current issue is the same as power management issue on the previous model with i9, but it might worth a read (the content have been removed, looking at the comments TS seems to have a profound knowledge and have done a lot of research on this issue) because the same hacky solution i mention above can be applied for this problem. Note that Apple have fixed this problem with software updates.
 
I reported this problem yesterday in a post here but it has already been mentioned by you on that thread.

I took my equipment that has the same configuration and the same symptom that even annoys typing when we plug in an external monitor. Assistance said my power cord had problems but everything was fine, but it wasn't, it's not.

I complained again at Apple service but unfortunately not everyone has so much knowledge to help, but they collected diagnostic data from my machine, and after an analysis by the engineering team, they reported that it is as expected, that it is correct.


I do not consider that the heating size is correct, so I requested a copy of the recording of the audio conversations, because if I have problems of force majeure with parts or other problems that may occur I will present this audio to them to repair the machine.

Too bad, but the machine is too expensive to do that. We have to make this public.
 
Thank you for the detailed solutions. Too add to your solution, i found this solution on reddit but please be careful as the downside is quite dangerous for your skin.

I'm not quite sure if the current issue is the same as power management issue on the previous model with i9, but it might worth a read (the content have been removed, looking at the comments TS seems to have a profound knowledge and have done a lot of research on this issue) because the same hacky solution i mention above can be applied for this problem. Note that Apple have fixed this problem with software updates.

i am going to try this!
 
This issue has been going on ever since the 16" MBP was released , it is there. Anyone with a 16" MBP with a 5300M or 5500M can get this issue. The temps increase by 20C and GPU wattage increases from 0W to 20W, as soon as the MBP is plugged to any display. I am actually annoyed that no one is reporting this in the tech media.

MacRumours posted the USB 2.0 issue and that promoted Apple to fix the USB 2.0 issue with the MBA 2020 and MBP 2020.

This post is seperate to the "16" is HOT & NOISY with an external monitor! :(", this post is to get public awareness about this issue.

The fact that issue can be fixed in Windows 10 with third party AMD Drivers shows that this is driver problem.

Apple's response has been deceitful, arrogant and callous. Apple has lost me as a loyal customer FOREVER over my experience with the 16" MBP and Apple Tech / Customer support. I've already replaced 3 Apple devices with non-Apple alternatives...and surprise!...they perform as well and in some ways BETTER! I'm happy to be freeing myself from the Apple cult.
 
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Apple's response has been deceitful, arrogant and callous. Apple has lost me as a loyal customer FOREVER over my experience with the 16" MBP and Apple Tech / Customer support. I've already replaced 3 Apple devices with non-Apple alternatives...and surprise!...they perform as well and in some ways BETTER! I'm happy to be freeing myself from the Apple cult.

well apple gave me a free Apple TV 4K to Airplay and to extend my Mac screen, and its a workaround.
And yes it fixes the heat issue. But apple still needs to give out proper a fix.

yes I agree with Apple not fixing this promptly, but I think its ask to due with AMD not bothering to update the drivers.

16" is great laptop, I only ever had 1 kernel panic due to power nap but its fixed in 10.15.6
 
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