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Might be an AMD driver and/or Metal issue. I have the same issues with multiple monitors on my MBP 16 2.3G i9 32G 5500M 4GB. But also have crashes with screen tearing when playing Civ VI. I have stress tested it with Heaven and works fine but this uses OpenGL. I have heard that Metal is the issue and Civ VI uses Metal. Contacted Aspyr to figure out how to put into Open GL mode to see if I have the same issues.

Especially that in safe mode, the power consumption is much lower.
 
Especially that in safe mode, the power consumption is much lower.

Before crashing, I noticed that it uses all of the 4GB of the GPU memory very quickly. The level of memory usage maybe normal, however my Heaven stress test used a fraction of the memory. I am hoping that this is just a a driver issue but this problem seems to be dragging out for a long time and Apple has not delivered a solution except to stop using other companies' silicon.
 
Radeon VII from my cMP which died last month... On MacOS side, while working, watching YT, watching movies RVII is silent. Only while gaming RVII gets louder. I use headphones while gaming so it not bothers me at all :)

In terms of performance the MBP16 + eGPU RVII seems snappier and faster than my maxed out, dead cMP (2x5690 cpus).
When working remotely I'm using my 5500 dGPU which is great and enough for what I do.

What is the state of eGPU on Windows?

It's working but hard to achieve and not bulletproof, any Windows update can mess it up. It is said that Nvidia gpus are mostly plug and play, and AMD cards give many problems. The community and Windows devs are working on some solutions though for newest MBP and AMD cards. But after some weekend long testing I achieved full eGPU support under Bootcamp. Some games runs very well, even great, on ultra settings 1440p like Doom Eternal gives 90-144 fps, Witcher 3 runs 144 fps on Ultra too, but some games struggles like RDR2 30-60 fps only.

With some cpu tweaks (QuickCPU) I can game with i9 with all cores active at 3,5-4GHz without any throttling :) Which is optimal for games due to TB3 bandwidth.
It is not advised to run the cpu in Turbo Boost mode open up to 5 GHz.
It won't give you any decent fps boost, instead it generates too much heat and stresses the machine greatly.

So it's great overall, highly recommended!
 
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It's working but hard to achieve and not bulletproof, any Windows update can mess it up. It is said that Nvidia gpus are mostly plug and play, and AMD cards give many problems. The community and Windows devs are working on some solutions though for newest MBP and AMD cards. But after some weekend long testing I achieved full eGPU support under Bootcamp. Some games runs very well, even great, on ultra settings 1440p like Doom Eternal gives 90-144 fps, Witcher 3 runs 144 fps on Ultra too, but some games struggles like RDR2 30-60 fps only.

With some cpu tweaks (QuickCPU) I can game with i9 with all cores active at 3,5-4GHz without any throttling :) Which is optimal for games due to TB3 bandwidth.
It is not advised to run the cpu in Turbo Boost mode open up to 5 GHz.
It won't give you any decent fps boost, instead it generates too much heat and stresses the machine greatly.

So it's great overall, highly recommended!

Thanks for the reply, very helpful.
 
Radeon VII from my cMP which died last month... On MacOS side, while working, watching YT, watching movies RVII is silent. Only while gaming RVII gets louder. I use headphones while gaming so it not bothers me at all :)

In terms of performance the MBP16 + eGPU RVII seems snappier and faster than my maxed out, dead cMP (2x5690 cpus).
When working remotely I'm using my 5500 dGPU which is great and enough for what I do.



It's working but hard to achieve and not bulletproof, any Windows update can mess it up. It is said that Nvidia gpus are mostly plug and play, and AMD cards give many problems. The community and Windows devs are working on some solutions though for newest MBP and AMD cards. But after some weekend long testing I achieved full eGPU support under Bootcamp. Some games runs very well, even great, on ultra settings 1440p like Doom Eternal gives 90-144 fps, Witcher 3 runs 144 fps on Ultra too, but some games struggles like RDR2 30-60 fps only.

With some cpu tweaks (QuickCPU) I can game with i9 with all cores active at 3,5-4GHz without any throttling :) Which is optimal for games due to TB3 bandwidth.
It is not advised to run the cpu in Turbo Boost mode open up to 5 GHz.
It won't give you any decent fps boost, instead it generates too much heat and stresses the machine greatly.

So it's great overall, highly recommended!

Are you gaming in MacOS or bootcamp?

An eGPU is pretty much required with these machines if you want to use an external monitor unfortunately. Even with the 5600M it can’t even handle youtube videos on my XDR display. It’s making me strongly consider getting a Mac Pro but Apple really does not deserve more money for their poor handling of this issue. It’s butterfly keyboard gate all over again. Maybe in a few years if we’re lucky and enough people complain about this Apple *might* fix this but I won’t hold my breath. Their new silicon Macs will be out by then and we’ll have moved on to machines that allow us to actually get work done quietly
 
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Are you gaming in MacOS or bootcamp?

An eGPU is pretty much required with these machines if you want to use an external monitor unfortunately. Even with the 5600M it can’t even handle youtube videos on my XDR display. It’s making me strongly consider getting a Mac Pro but Apple really does not deserve more money for their poor handling of this issue. It’s butterfly keyboard gate all over again. Maybe in a few years if we’re lucky and enough people complain about this Apple *might* fix this but I won’t hold my breath. Their new silicon Macs will be out by then and we’ll have moved on to machines that allow us to actually get work done quietly
Windows. macOS and Gaming Is, well... 😅
 
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Are you gaming in MacOS or bootcamp?

An eGPU is pretty much required with these machines if you want to use an external monitor unfortunately. Even with the 5600M it can’t even handle youtube videos on my XDR display. It’s making me strongly consider getting a Mac Pro but Apple really does not deserve more money for their poor handling of this issue. It’s butterfly keyboard gate all over again. Maybe in a few years if we’re lucky and enough people complain about this Apple *might* fix this but I won’t hold my breath. Their new silicon Macs will be out by then and we’ll have moved on to machines that allow us to actually get work done quietly

I find it scary that everybody assumes this.
It it's like that then great but but I'm holing my money close till at least gen2.
 
I find it scary that everybody assumes this.
It it's like that then great but but I'm holing my money close till at least gen2.

Yeah 100%. No way am I going to be Apple's guinea pig after seeing how Apple continues to deny the external monitor overheating issue is "acting normally" in the first generation of 16" MBPs.

Probably have to wait 3-4 generations at least before the major bugs are sorted out.
 
I find it scary that everybody assumes this.
It it's like that then great but but I'm holing my money close till at least gen2.

Oh I’m definitely waiting a couple years before I get an ARM Mac. I was saying by that time most of us will have moved on to other machines that actually work as they’re intended to such as desktops, PC, hackintosh, etc. Waiting around for Apple to fix the 16” heat problem is a fruitless endeavor
 
Yeah 100%. No way am I going to be Apple's guinea pig after seeing how Apple continues to deny the external monitor overheating issue is "acting normally" in the first generation of 16" MBPs.

Probably have to wait 3-4 generations at least before the major bugs are sorted out.
If true, then I see no viable Mac for me...cuz I ain't waiting 3-4 years to dump this 16". New iMac isn't exactly cool and quiet either! Is PC the best option?
 
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Fingers crossed the refresh in the next few months (hopefully there is one so I can snag the last Intel 16) goes back to the set up that the 15s had -- or solves this in some other way.
 
I was also thinking of waiting for an update to the 16" before the end of the year, but at this point we would already know about it, right?
 
I have raised a ticket to Apple and request to run the same diagnostic with 15" MBP. Anyone has a machine who is willing to run the diagnostic with Apple? DM me.
 
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Hello, i read about the issues with the 16” 5300 and 5500 series GPUs with external monitors and i decide to buy the 5600m (I9 64gb 1tb) but other than that not sure if I should get the 2.3 or 2.4 cpu.Do you think the 2.3 will run cooler and more silent than the 2.4 or vice a versa?
 
Hello, i read about the issues with the 16” 5300 and 5500 series GPUs with external monitors and i decide to buy the 5600m (I9 64gb 1tb) but other than that not sure if I should get the 2.3 or 2.4 cpu.Do you think the 2.3 will run cooler and more silent than the 2.4 or vice a versa?

No reason to expect a meaningful difference between those. Light load stresses neither, yet is enough to spin the fans with most ext monitor setups.
 
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I was also thinking of waiting for an update to the 16" before the end of the year, but at this point we would already know about it, right?

Why? Up until now the somewhat consensus in this thread was there might be a light refresh. And given the 15 did not have this problem (to such a degree) it's not without reason to think it might be a blip. But correct me if I'm wrong. I assume Apple doesn't give a crap, yes.
 
We need one of the many talented people in the hackintosh community to take a look into this, seeing if it is in fact a driver issue as some have suggested, or a hardware flaw.

With a little evidence we would be on better ground. As it stands Apple is gonna say or do nothing.
 
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Are you gaming in MacOS or bootcamp?

An eGPU is pretty much required with these machines if you want to use an external monitor unfortunately. Even with the 5600M it can’t even handle youtube videos on my XDR display. It’s making me strongly consider getting a Mac Pro but Apple really does not deserve more money for their poor handling of this issue. It’s butterfly keyboard gate all over again. Maybe in a few years if we’re lucky and enough people complain about this Apple *might* fix this but I won’t hold my breath. Their new silicon Macs will be out by then and we’ll have moved on to machines that allow us to actually get work done quietly
Wait...what? 5600m and your MBP still can't handle YT videos on the XDR display?
 
Is there anybody in this thread that ist using the LG 34WK95U (5K2K) monitor with his MBP 16" as single external monitor in clamshell mode? If so, how is the performance and more importantly, how is the idle temperature and Radeon High Side?
 
We need one of the many talented people in the hackintosh community to take a look into this, seeing if it is in fact a driver issue as some have suggested, or a hardware flaw.

With a little evidence we would be on better ground. As it stands Apple is gonna say or do nothing.
I agree in 100% with you. We can compare its volume and power consumption to previous models. But in the end, Apple can always say that the current model just behaves differently and this is normal behavior. And that's what they do now.
 
Is there anybody in this thread that ist using the LG 34WK95U (5K2K) monitor with his MBP 16" as single external monitor in clamshell mode? If so, how is the performance and more importantly, how is the idle temperature and Radeon High Side?

I actually just finished installing this setup. Reading this thread made me want to try it with the 5600M.

Some info:

  • MBP 16" 2,3GHz i9, 32GB RAM, 5600M graphics.
  • Clamshell mode
  • LG 34WK95U on a desk-mounted arm. Using the provided TB3 cable by LG.
  • Resolution: 3360x1417 HiDPI (full 5k2k resolution is tiny! Very sharp looking though, but so is this)
    • Mac standard scaled resolution in the Display settings pane, one to the right (more space)
    • As confirmed by SwitchResX but not using it at this time to see what standard performance is like regarding to screen discovery etc after sleep/wake-up/plug-in
  • Wallpaper resolution: 3440 x 1440
  • Connections:
    • 1 port: TB3 cable for display/charging
    • 1 port: TB3 (USB-C) to TB2 adapter --> TB2 to ethernet adapter (seriously, Apple. Double dongles for RJ45?)
    • Both connected on the same side.
I had a small issue at first connection to get the display recognised. (Did not show scaling modes, did not recognize the full resolution. I'm not sure how I fixed it but at second try it did recognize the monitor and it has worked since. I also installed SwitchResX around that time and some LG monitor software so maybe it helped but I'm not sure. The LG software was not specific for the monitor by the way and not visible on the monitor's dedicated page..
That's why I'm running it with that disabled now for tests. (working fine for 2 days now)

Temps/Power after a few minutes idle:

  • CPU:
    • 48°C proximity with some cores dipping as low as 45°C
    • Opening safari to open and create this thread the cores jump shortly to about 55°C, but while i'm typing this they dropped back to 44-46°C
    • For reference: Idle without external monitor I've noticed so far is around 40°C
  • GPU:
    • Radeon High Side 5.45W up to just under 7W when moving a window etc.
    • 5600M: 51°C, proximity 42-48°C
    • Intel UHD 630: 47°C
  • Thunderbolt Port:
    • 60 - 65°C
    • I've tried both left and right ports they heat up the same. Power and data over TB3 generates some heat! The connector is warm to the touch but not scalding or anything.
  • Fans:
    • Around 1770 RPM all the time, quiet, unnoticeable.
    • Left side higher by about 100RPM because TB3 ports connected on that side I assume.
Note: This is Idle after a few minutes. Safari open with one tab (website), Messages open, Mail and Activity monitor open in the background. Also, I do have airconditioning in this room.

General/Performance

Everything feels quick and responsive. Same as without the external display.

The first few hours/days my photo library was being scanned for faces etc and the temps were about 10°C higher.

Also, watching youtube videos for some time makes this easily jump up but depends on the browser, size you're watching and the quality of the content. Full screen chrome 4k 21:9 HDR footage it's about 75°C (And looks amazing). Normal small youtube viewing I'd say 54-62°C so far.

Attached: iStat sensor data just before opening this website with the apps open as mentioned above.

3360x1417 hidpi.png



Phew, that turned out to be way more text than anticipated lol.
 
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We need one of the many talented people in the hackintosh community to take a look into this, seeing if it is in fact a driver issue as some have suggested, or a hardware flaw.

With a little evidence we would be on better ground. As it stands Apple is gonna say or do nothing.

My understanding is that the 16" need to run the video memory clock at maximum speed to comply with requirements on video timing IF, you run two screens with DIFFERENT resolution or one screen with a "bad" combination of resolution and refresh rate. When the memory clock runs at maximum 5500 consumes 18W, 5600 consumes less due to more performant memory. So far I believe this explanation is consistent with the data presented in this thread.

What I hear is that both AMD and Apple has said (repeatedly) that this works as designed and there is nothing to fix.

"More of the same" arguments will hardly help against Apple. Is it possible to find a new angle. If the 16" performs as designed, why does the 15" consume less? Does it not comply to video timing requirements?
 
I actually just finished installing this setup. Reading this thread made me want to try it with the 5600M.

Some info:

  • MBP 16" 2,3GHz i9, 32GB RAM, 5600M graphics.
  • Clamshell mode
  • LG 34WK95U on a desk-mounted arm. Using the provided TB3 cable by LG.
  • Resolution: 3360x1417 HiDPI (full 5k2k resolution is tiny! Very sharp looking though, but so is this)
    • Mac standard scaled resolution in the Display settings pane, one to the right (more space)
    • As confirmed by SwitchResX but not using it at this time to see what standard performance is like regarding to screen discovery etc after sleep/wake-up/plug-in
  • Wallpaper resolution: 3440 x 1440
  • Connections:
    • 1 port: TB3 cable for display/charging
    • 1 port: TB3 (USB-C) to TB2 adapter --> TB2 to ethernet adapter (seriously, Apple. Double dongles for RJ45?)
    • Both connected on the same side.
I had a small issue at first connection to get the display recognised. (Did not show scaling modes, did not recognize the full resolution. I'm not sure how I fixed it but at second try it did recognize the monitor and it has worked since. I also installed SwitchResX around that time and some LG monitor software so maybe it helped but I'm not sure. The LG software was not specific for the monitor by the way and not visible on the monitor's dedicated page..
That's why I'm running it with that disabled now for tests. (working fine for 2 days now)

Temps/Power after a few minutes idle:

  • CPU:
    • 48°C proximity with some cores dipping as low as 45°C
    • Opening safari to open and create this thread the cores jump shortly to about 55°C, but while i'm typing this they dropped back to 44-46°C
    • For reference: Idle without external monitor I've noticed so far is around 40°C
  • GPU:
    • Radeon High Side 5.45W up to just under 7W when moving a window etc.
    • 5600M: 51°C, proximity 42-48°C
    • Intel UHD 630: 47°C
  • Thunderbolt Port:
    • 60 - 65°C
    • I've tried both left and right ports they heat up the same. Power and data over TB3 generates some heat! The connector is warm to the touch but not scalding or anything.
  • Fans:
    • Around 1770 RPM all the time, quiet, unnoticeable.
    • Left side higher by about 100RPM because TB3 ports connected on that side I assume.
Note: This is Idle after a few minutes. Safari open with one tab (website), Messages open, Mail and Activity monitor open in the background. Also, I do have airconditioning in this room.

General/Performance

Everything feels quick and responsive. Same as without the external display.

The first few hours/days my photo library was being scanned for faces etc and the temps were about 10°C higher.

Also, watching youtube videos for some time makes this easily jump up but depends on the browser, size you're watching and the quality of the content. Full screen chrome 4k 21:9 HDR footage it's about 75°C (And looks amazing). Normal small youtube viewing I'd say 54-62°C so far.

Attached: iStat sensor data just before opening this website with the apps open as mentioned above.

View attachment 945558


Phew, that turned out to be way more text than anticipated lol.
Wow! Thx for your very detailed response. Seems like everything is fine with your configuration. I have the base model (5300m) and I'm seriously considering this monitor. I guess I have to try and find out whether this monitor also works nice and quietly with the 5300m. Do you have those wake up issues when the MBP is in sleep mode and the monitor stays dark and doesn't respond? The web is full of this issue.
 
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